A five-layer high-barrier aluminized biaxially oriented polyethylene base film

Abstract

The present application relates to the technical field of film preparation, and discloses a five-layer high-barrier biaxially oriented polyethylene aluminized base film. The five-layer high-barrier biaxially oriented polyethylene aluminized base film comprises extrusion layer A, extrusion layer B, a polyethylene aluminized film layer, extrusion layer b and extrusion layer a in sequence. The raw materials for preparing the extrusion layer A and the extrusion layer a comprise multi-carbon copolymerized polyethylene and silicon dioxide. The raw materials for preparing the extrusion layer B and the extrusion layer b comprise multi-carbon copolymerized polyethylene and fillers. The five-layer high-barrier biaxially oriented polyethylene aluminized base film has excellent puncture resistance and high barrier performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film preparation, in particular to a five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film. BACKGROUND

[0002] Biaxially oriented polyethylene film (BOPE) is a film formed by sequentially stretching special LLDPE or HDPE raw materials first longitudinally and then transversely; it has high heat sealing strength, good longitudinal and transverse tensile strength, and advantages such as moisture resistance and foldability. Therefore, it is widely used in various packaging materials.

[0003] Chinese invention patent 201911017167.8 discloses a biaxially oriented polyethylene composite film composed of a first polyethylene film (810), an optional polyethylene aluminum-coated film (830), and a third polyethylene film (850). It has excellent barrier properties; at the same time, it also has certain puncture performance, but its maximum puncture force is only 13.20N, which needs to be further improved. SUMMARY

[0004] In order to overcome at least one of the technical problems in the prior art, the present application first provides a five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film.

[0005] The technical solution of the present application to solve the above technical problems is as follows:

[0006] The present application first provides a five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film, which comprises extrusion layer A, extrusion layer B, polyethylene aluminum-coated film layer, extrusion layer b, and extrusion layer a in sequence.

[0007] The present application provides a five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film with a new structure; compared with the prior art, the five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film has more excellent puncture resistance.

[0008] Preferably, the preparation raw material of extrusion layer A and extrusion layer a comprises multi-carbon copolymerized polyethylene and silicon dioxide.

[0009] Preferably, the weight ratio of multi-carbon copolymerized polyethylene to silicon dioxide is 100:1-10.

[0010] Most preferably, the weight ratio of multi-carbon copolymerized polyethylene to silicon dioxide is 100:5.

[0011] Preferably, the preparation raw material of extrusion layer B and extrusion layer b comprises multi-carbon copolymerized polyethylene and filler.

[0012] Preferably, the weight ratio of multi-carbon copolymerized polyethylene to filler is 100:20-40.

[0013] Most preferably, the weight ratio of the multi-carbon copolyethylene and the filler is 100:30.

[0014] Preferably, the filler consists of glass fiber powder and zirconium dioxide powder.

[0015] Preferably, the weight ratio of the glass fiber powder and the zirconium dioxide powder is 2-4:1.

[0016] Most preferably, the weight ratio of the glass fiber powder and the zirconium dioxide powder is 3:1.

[0017] Preferably, the filler is a modified filler.

[0018] The modified filler is prepared by the following method:

[0019] (1) Glass fiber powder and zirconium dioxide powder are added to water and stirred to obtain a mixed slurry;

[0020] (2) Fatty alcohol amide 704 and hydroxyethyl cellulose are added to the mixed slurry and stirred for 2-6 hours to obtain a mixture;

[0021] (3) The mixture is concentrated and dried to obtain the modified filler.

[0022] The inventors found in their research that, compared with the filler consisting of glass fiber powder and zirconium dioxide powder without modification, the addition of the modified filler obtained by modifying the glass fiber powder and the zirconium dioxide powder by the above method in the extrusion layer B and the extrusion layer b can greatly improve the puncture resistance of the five-layer high-barrier biaxially oriented polyethylene aluminum-plated substrate film.

[0023] Preferably, the weight ratio of the glass fiber powder, the zirconium dioxide powder, and water in step (1) is 2-4:1:20-30.

[0024] Most preferably, the weight ratio of the glass fiber powder, the zirconium dioxide powder, and water in step (1) is 3:1:24.

[0025] Preferably, the weight ratio of the mixed slurry, fatty alcohol amide 704, and hydroxyethyl cellulose in step (2) is 100:1-3:1-3.

[0026] Most preferably, the weight ratio of the mixed slurry, fatty alcohol amide 704, and hydroxyethyl cellulose in step (2) is 100:2:1.

[0027] Preferably, the thicknesses of the extrusion layer A and the extrusion layer a are 10-20 μm, respectively; the thickness of the polyethylene aluminum-plated film layer is 20-40 μm; and the thicknesses of the extrusion layer B and the extrusion layer b are 15-25 μm.

[0028] Most preferably, the thicknesses of the extrusion layer A and the extrusion layer a are 15 μm respectively; the thickness of the polyethylene aluminized film layer is 30 μm; the thicknesses of the extrusion layer B and the extrusion layer b are 20 μm.

[0029] Beneficial effects: the present application provides a five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film with a brand-new structure; compared with the prior art, the five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film has more excellent puncture resistance. Especially, by adding the modified filler obtained by modifying the glass fiber powder and the zirconium dioxide powder through the above method in the extrusion layer B and the extrusion layer b, compared with adding the filler composed of the unmodified glass fiber powder and the zirconium dioxide powder, the puncture resistance of the five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film of the present application can be greatly improved. In addition, the five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film of the present application also has high barrier properties. DETAILED DESCRIPTION

[0030] The present application will be further explained in combination with specific embodiments below, but the embodiments do not limit the present application in any form.

[0031] The multi-carbon copolymerized polyethylene in the following examples is a BOPE special material of Sinopec. The remaining raw materials are conventional raw materials that can be purchased or prepared by conventional methods by those skilled in the art.

[0032] Example 1 five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film

[0033] The five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film comprises, in sequence, an extrusion layer A, an extrusion layer B, a polyethylene aluminized film layer, an extrusion layer b and an extrusion layer a; wherein the thicknesses of the extrusion layer A and the extrusion layer a are 15 μm respectively; the thickness of the polyethylene aluminized film layer is 30 μm; the thicknesses of the extrusion layer B and the extrusion layer b are 20 μm;

[0034] The extrusion layer A and the extrusion layer a are respectively prepared from multi-carbon copolymerized polyethylene and silicon dioxide with a weight ratio of 100:5 as raw materials;

[0035] The extrusion layer B and the extrusion layer b are respectively prepared from multi-carbon copolymerized polyethylene and a filler with a weight ratio of 100:30 as raw materials;

[0036] The filler is composed of glass fiber powder and zirconium dioxide powder with a weight ratio of 3:1.

[0037] Example 2 five-layer high-barrier bidirectional stretching polyethylene aluminized substrate film

[0038] The five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film comprises extrusion layer A, extrusion layer B, polyethylene aluminum-coated film layer, extrusion layer b and extrusion layer a in sequence; wherein the thicknesses of the extrusion layer A and the extrusion layer a are 15 μm respectively; the thickness of the polyethylene aluminum-coated film layer is 30 μm; the thicknesses of the extrusion layer B and the extrusion layer b are 20 μm;

[0039] The extrusion layer A and the extrusion layer a are respectively prepared from multi-carbon copolymerized polyethylene and silicon dioxide as raw materials in a weight ratio of 100:5;

[0040] The extrusion layer B and the extrusion layer b are respectively prepared from multi-carbon copolymerized polyethylene and fillers as raw materials in a weight ratio of 100:30;

[0041] The filler is a modified filler;

[0042] The modified filler is prepared by the following method:

[0043] (1) glass fiber powder and zirconium dioxide powder are added to water, and stirred for 20 min to obtain a mixed slurry; wherein the weight ratio of the glass fiber powder, the zirconium dioxide powder and the water is 3:1:24;

[0044] (2) fatty alcohol amide 704 and hydroxyethyl cellulose are added to the mixed slurry, and stirred for 3 h to obtain a mixture; wherein the weight ratio of the mixed slurry, the fatty alcohol amide 704 and the hydroxyethyl cellulose is 100:2:1;

[0045] (3) the mixture is concentrated and dried to obtain the modified filler.

[0046] Comparative Example 1 five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film

[0047] The five-layer high-barrier biaxially oriented polyethylene aluminum-coated substrate film comprises extrusion layer A, extrusion layer B, polyethylene aluminum-coated film layer, extrusion layer b and extrusion layer a in sequence; wherein the thicknesses of the extrusion layer A and the extrusion layer a are 15 μm respectively; the thickness of the polyethylene aluminum-coated film layer is 30 μm; the thicknesses of the extrusion layer B and the extrusion layer b are 20 μm;

[0048] The extrusion layer A and the extrusion layer a are respectively prepared from multi-carbon copolymerized polyethylene and silicon dioxide as raw materials in a weight ratio of 100:5;

[0049] The extrusion layer B and the extrusion layer b are respectively prepared from multi-carbon copolymerized polyethylene and fillers as raw materials in a weight ratio of 100:30;

[0050] The filler is a modified filler;

[0051] The modified filler is prepared by the following method:

[0052] (1) Take glass fiber powder and zirconium dioxide powder and add them to water, stir for 20 min to obtain a mixed slurry; wherein the weight ratio of glass fiber powder, zirconium dioxide powder and water is 3:1:24;

[0053] (2) Add fatty alcohol amide 704 to the mixed slurry, mix and stir for 3 h to obtain a mixture; wherein the weight ratio of the mixed slurry and fatty alcohol amide 704 is 100:3;

[0054] (3) Concentrate and dry the mixture to obtain the modified filler.

[0055] The difference between Comparative Example 1 and Example 2 is that in the preparation of the modified filler, Comparative Example 2 only uses fatty alcohol amide 704 to modify the glass fiber powder and zirconium dioxide powder; while Example 2 uses both fatty alcohol amide 704 and hydroxyethyl cellulose to modify the glass fiber powder and zirconium dioxide powder.

[0056] Five-layer high-barrier biaxially stretched polyethylene aluminum-coated base material film

[0057] The five-layer high-barrier biaxially stretched polyethylene aluminum-coated base material film comprises, in order, an extrusion layer A, an extrusion layer B, a polyethylene aluminum-coated film layer, an extrusion layer b and an extrusion layer a; wherein the thicknesses of the extrusion layer A and the extrusion layer a are 15 μm respectively; the thickness of the polyethylene aluminum-coated film layer is 30 μm; the thicknesses of the extrusion layer B and the extrusion layer b are 20 μm;

[0058] The extrusion layer A and the extrusion layer a are respectively prepared from polycarbon copolymerized polyethylene and silicon dioxide with a weight ratio of 100:5 as raw materials;

[0059] The extrusion layer B and the extrusion layer b are respectively prepared from polycarbon copolymerized polyethylene and filler with a weight ratio of 100:30 as raw materials;

[0060] The filler is a modified filler;

[0061] The modified filler is prepared by the following method:

[0062] (1) Take glass fiber powder and zirconium dioxide powder and add them to water, stir for 20 min to obtain a mixed slurry; wherein the weight ratio of glass fiber powder, zirconium dioxide powder and water is 3:1:24;

[0063] (2) Add hydroxyethyl cellulose to the mixed slurry, mix and stir for 3 h to obtain a mixture; wherein the weight ratio of the mixed slurry and hydroxyethyl cellulose is 100:3;

[0064] (3) Concentrate and dry the mixture to obtain the modified filler.

[0065] The difference between Comparative Example 1 and Example 2 is that, in the preparation step of the modified filler, Comparative Example 2 only uses hydroxyethyl cellulose to modify the glass fiber powder and zirconium dioxide powder; while Example 2 uses both fatty alcohol amide 704 and hydroxyethyl cellulose to modify the glass fiber powder and zirconium dioxide powder.

[0066] Table 1. Performance test of the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film

[0067]

[0068] As can be seen from the experimental data in Table 1, the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film has a low oxygen transmission rate, which indicates that the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film has high barrier properties.

[0069] As can be seen from the experimental data in Table 1, the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film has a high puncture strength. In particular, the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film described in Example 2 has a significantly higher puncture strength than the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film described in Example 1, which indicates that the addition of the modified filler obtained by modifying the glass fiber powder and zirconium dioxide powder by the method described in the present application in the extrusion layer B and the extrusion layer b can significantly improve the puncture resistance of the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film.

[0070] As can be seen from the experimental data in Table 1, the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film described in Comparative Examples 1 and 2 has a higher puncture strength than the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film described in Example 1, but the improvement is not significant, and the improvement is much smaller than that of the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film described in Example 2. This indicates that the selection of the modifier in the modified filler is crucial; in the extrusion layer B and the extrusion layer b, the modified filler obtained by simultaneously modifying the glass fiber powder and zirconium dioxide powder with fatty alcohol amide 704 and hydroxyethyl cellulose must be added to further significantly improve the puncture resistance of the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film; however, the addition of the modified filler obtained by modifying the glass fiber powder and zirconium dioxide powder with only fatty alcohol amide or only hydroxyethyl cellulose cannot further significantly improve the puncture resistance of the five-layer high-barrier biaxially-stretched polyethylene aluminum-plated base material film.

Claims

1. A five-layer high-barrier, bi-axially oriented polyethylene, aluminum- coated substrate film, characterized in that, The extrusion layer A, the extrusion layer B, the polyethylene aluminized film layer, the extrusion layer b and the extrusion layer a are sequentially arranged. The preparation raw materials of the extrusion layer B and the extrusion layer b both comprise multi-carbon copolymerized polyethylene and fillers, and the weight ratio of the multi-carbon copolymerized polyethylene to the fillers in the extrusion layer B and the extrusion layer b is 100:20-40. The filler is a modified filler. The modified filler is prepared by the following method: (1) glass fiber powder and zirconium dioxide powder are added into water, and stirred to obtain a mixed slurry; (2) fatty alcohol amide 704 and hydroxyethyl cellulose are added into the mixed slurry, and stirred for 2-6 hours to obtain a mixture; (3) the mixture is concentrated and dried to obtain the modified filler; In step (1), the weight ratio of the glass fiber powder, the zirconium dioxide powder and the water is 2-4:1:20-30. In step (2), the weight ratio of the mixed slurry, the fatty alcohol amide 704 and the hydroxyethyl cellulose is 100:1-3:1-3.

2. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 1, wherein, The preparation raw materials of the extrusion layer A and the extrusion layer a both comprise multi-carbon copolymerized polyethylene and silicon dioxide.

3. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 2, wherein, The weight ratio of the multi-carbon copolymerized polyethylene to the silicon dioxide in the extrusion layer A and the extrusion layer a is 100:1-10.

4. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 3, wherein, The weight ratio of the multi-carbon copolymerized polyethylene to the silicon dioxide in the extrusion layer A and the extrusion layer a is 100:

5.

5. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 4, wherein, The weight ratio of the multi-carbon copolymerized polyethylene to the fillers in the extrusion layer B and the extrusion layer b is 100:

30.

6. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 1, wherein, In step (1), the weight ratio of the glass fiber powder, the zirconium dioxide powder and the water is 3:1:

24.

7. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 1, wherein, In step (2), the weight ratio of the mixed slurry, the fatty alcohol amide 704 and the hydroxyethyl cellulose is 100:2:

1.

8. The five layer high barrier, biaxially oriented polyethylene, aluminum- laminated substrate film according to claim 1, characterized in that, The thickness of the extrusion layer A and the extrusion layer a is 10-20 μm respectively; The thickness of the polyethylene aluminized film layer is 20-40 μm; and the thickness of the extrusion layer B and the extrusion layer b is 15-25 μm.

9. The five layer high barrier, bi-oriented polyethylene, aluminum plated substrate film of claim 8, wherein, The thickness of the extrusion layer A and the extrusion layer a is 15 μm respectively; the thickness of the polyethylene aluminized film layer is 30 μm; and the thickness of the extrusion layer B and the extrusion layer b is 20 μm.

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