High-strength plastic packaging material and method for producing the same

Abstract

This invention relates to the field of polymer materials technology, and proposes a high-strength plastic packaging material and its preparation method. The high-strength plastic packaging material comprises the following raw materials in parts by weight: 60-80 parts of random copolymer polypropylene, 20-30 parts of polyolefin elastomer, 10-15 parts of block copolymer polypropylene, 10-15 parts of polyethylene terephthalate, 8-12 parts of TiO2-Al2O3 composite oxide modified basalt fiber, 1-3 parts of lubricant, and 3-5 parts of compatibilizer; the TiO2-Al2O3 composite oxide modified basalt fiber comprises the following raw materials in parts by weight: 100 parts of basalt fiber, 7-13 parts of aluminum nitrate, and 2-8 parts of isopropyl titanate. This technical solution solves the problem of low strength in related plastic packaging materials.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a high-strength plastic packaging material and its preparation method. Background Technology

[0002] Plastic packaging materials are a type of packaging material made primarily from synthetic or natural polymers, with the addition of various additives, and processed into various forms. They possess advantages such as light weight, good chemical resistance, ease of molding, and low cost. As one of the four core materials in the packaging industry, they occupy an important position in the packaging of various commodities. With global economic development, the rise of e-commerce logistics, and the rapid expansion of industries such as food, pharmaceuticals, and daily chemicals, plastic packaging, with its protective, lightweight, and adaptable characteristics, is widely used in various scenarios such as product packaging, logistics transportation, and preservation storage, becoming an indispensable part of the commodity circulation system, and market demand continues to rise.

[0003] However, existing plastic packaging materials have poor tensile strength and are prone to breakage during transportation, leading to damage to the products inside and limiting their application in areas such as heavy-duty packaging and packaging of sharp objects. Therefore, to address the problem of insufficient strength in existing plastic packaging materials, it is necessary to propose a high-strength plastic packaging material and its preparation method. Summary of the Invention

[0004] This invention proposes a high-strength plastic packaging material and its preparation method, which solves the problem of low strength in plastic packaging materials in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a high-strength plastic packaging material, comprising the following raw materials in parts by weight: 60-80 parts of random copolymer polypropylene, 20-30 parts of polyolefin elastomer, 10-15 parts of block copolymer polypropylene, 10-15 parts of polyethylene terephthalate, 8-12 parts of TiO2-Al2O3 composite oxide modified basalt fiber, 1-3 parts of lubricant, and 3-5 parts of compatibilizer; The TiO2-Al2O3 composite oxide modified basalt fiber comprises the following raw materials in parts by weight: 100 parts basalt fiber, 7-13 parts aluminum nitrate, and 2-8 parts isopropyl titanate.

[0006] As a further technical solution, the mass ratio of aluminum nitrate to isopropyl titanate is 1~3:1, preferably 2:1.

[0007] As a further technical solution, the preparation method of the TiO2-Al2O3 composite oxide modified basalt fiber includes the following steps: A1. Basalt fiber is soaked in phytic acid aqueous solution, then washed and dried to obtain pretreated basalt fiber. A2. Disperse aluminum nitrate, isopropyl titanate, and chelating agent in a solvent, then add water and nitric acid in sequence to obtain a sol solution; A3. The pretreated basalt fiber is mixed with the sol solution, filtered, washed and dried to obtain the TiO2-Al2O3 composite oxide modified basalt fiber.

[0008] As a further technical solution, the concentration of the phytic acid aqueous solution is 3wt%~5wt%, preferably 5wt%; the mass-to-volume ratio of the basalt fiber and the phytic acid aqueous solution is 1g:9~11mL, preferably 1g:10mL.

[0009] As a further technical solution, in step A1, the soaking time is 20-30 minutes.

[0010] As a further technical solution, in step A2, the mass ratio of aluminum nitrate and isopropyl titanate to the chelating agent is 8~10:1, preferably 10:1.

[0011] As a further technical solution, in step A2, the mass ratio of aluminum nitrate, isopropyl titanate, chelating agent, and volume ratio of solvent is 1g:8~12mL, preferably 1g:10mL.

[0012] As a further technical solution, in step A2, the solvent is anhydrous ethanol.

[0013] As a further technical solution, in step A2, the mass ratio of aluminum nitrate and isopropyl titanate to water is 1g:2~4mL, preferably 1g:3mL; the mass ratio of aluminum nitrate and isopropyl titanate to nitric acid is 10~12:1, preferably 12:1.

[0014] As a further technical solution, the chelating agent includes one or both of acetylacetone and citric acid.

[0015] As a further technical solution, in step A3, the mixing temperature is 80~90℃ and the time is 45~60min.

[0016] As a further technical solution, the polyethylene terephthalate includes a first polyethylene terephthalate and a second polyethylene terephthalate; the first polyethylene terephthalate and the second polyethylene terephthalate have different intrinsic viscosities.

[0017] As a further technical solution, the intrinsic viscosity of the first polyethylene terephthalate is 0.638~0.770 dL / g, preferably 0.638 dL / g; and the intrinsic viscosity of the second polyethylene terephthalate is 0.850~0.870 dL / g, preferably 0.870 dL / g.

[0018] This invention utilizes a blend of two polyethylene terephthalate (PET) esters with different intrinsic viscosities, which are then incorporated into plastic packaging materials to enhance their tear strength. The lower intrinsic viscosity PET ester (first PET) exhibits better flowability, improving the system's processing and dispersibility, promoting tighter interfacial bonding between components, and reducing internal defects. The higher intrinsic viscosity PET ester (second PET) has longer molecular chains, resulting in stronger entanglement with the matrix material and significantly improving the material's structural stability and tear resistance. Through a synergistic effect, both PET esters enhance the tear strength of the plastic packaging material.

[0019] As a further technical solution, the mass ratio of the first polyethylene terephthalate and the second polyethylene terephthalate is 1~3:2.5, preferably 2:2.5.

[0020] As a further technical solution, the lubricant includes one or more of calcium stearate, magnesium stearate, and zinc stearate.

[0021] As a further technical solution, the compatibilizer includes maleic anhydride-grafted polypropylene.

[0022] This invention also proposes a method for preparing a high-strength plastic packaging material, which includes the following steps: mixing random copolymer polypropylene, polyolefin elastomer, block copolymer polypropylene, polyethylene terephthalate and compatibilizer evenly, adding TiO2-Al2O3 composite oxide modified basalt fiber and lubricant and mixing, and then molding to obtain the high-strength plastic packaging material.

[0023] As a further technical solution, the molding includes one of blown film molding and cast film molding; the temperature of blown film molding is 215~230℃.

[0024] The working principle and beneficial effects of this invention are as follows: This invention improves the tensile strength of plastic packaging materials by introducing TiO2-Al2O3 composite oxide-modified basalt fibers prepared from basalt fibers, aluminum nitrate, and isopropyl titanate. In existing technologies, basalt fibers are often directly added to enhance the tensile strength of plastic packaging materials. However, untreated basalt fibers have low surface activity and poor compatibility, easily agglomerating and entangled in the matrix, hindering their reinforcing effect. The TiO2-Al2O3 composite oxide-modified basalt fibers prepared in this invention improve the surface properties of basalt fibers, enhance their dispersion and interfacial bonding in the plastic matrix, and allow stress to be better transferred from the matrix to the fibers, thereby improving the tensile strength of the plastic packaging materials. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] In the following examples and comparative examples, the random copolymer polypropylene is model F800E; the polyolefin elastomer is model 6102FL; the block copolymer polypropylene is model PC480A; the basalt fiber is 3 mm in length and 13 μm in diameter; and the maleic anhydride grafted polypropylene is model QF551.

[0027] Example 1 A high-strength plastic packaging material comprises the following raw materials in parts by weight: 60 parts of random copolymer polypropylene, 20 parts of polyolefin elastomer, 10 parts of block copolymer polypropylene, 10 parts of polyethylene terephthalate (intrinsic viscosity of 0.638 dL / g, model CZ-601), 8 parts of TiO2-Al2O3 composite oxide modified basalt fiber, 1 part of calcium stearate, and 3 parts of maleic anhydride grafted polypropylene. The preparation method of TiO2-Al2O3 composite oxide modified basalt fiber includes the following steps: A1. 100 parts of basalt fiber were soaked in a 5wt% phytic acid aqueous solution for 20 minutes, then washed and dried to obtain pretreated basalt fiber; the mass-volume ratio of basalt fiber to phytic acid aqueous solution was 1g:10mL. A2. Disperse 7.5 parts aluminum nitrate, 7.5 parts isopropyl titanate, and 1.5 parts acetylacetone in anhydrous ethanol, then add water and 1.25 parts nitric acid sequentially to obtain a sol solution; wherein the mass ratio of aluminum nitrate, isopropyl titanate, and chelating agent to the volume of anhydrous ethanol is 1 g:10 mL; the mass ratio of aluminum nitrate and isopropyl titanate to the mass-volume ratio of water is 1 g:3 mL; A3. After mixing the pretreated basalt fiber with the sol solution at 80℃ for 60 min, filter, wash and dry to obtain TiO2-Al2O3 composite oxide modified basalt fiber. A method for preparing a high-strength plastic packaging material includes the following steps: randomly copolymerized polypropylene, polyolefin elastomer, block copolymerized polypropylene, polyethylene terephthalate and maleic anhydride grafted polypropylene are mixed evenly, TiO2-Al2O3 composite oxide modified basalt fiber and lubricant are added and mixed, and then blown into a film at 215°C to obtain the high-strength plastic packaging material.

[0028] Example 2 A high-strength plastic packaging material comprises the following raw materials in parts by weight: 70 parts of random copolymer polypropylene, 25 parts of polyolefin elastomer, 13 parts of block copolymer polypropylene, 12 parts of polyethylene terephthalate (intrinsic viscosity of 0.638 dL / g, model CZ-601), 10 parts of TiO2-Al2O3 composite oxide modified basalt fiber, 2 parts of magnesium stearate, and 4 parts of maleic anhydride grafted polypropylene. The preparation method of TiO2-Al2O3 composite oxide modified basalt fiber includes the following steps: A1. 100 parts of basalt fiber were soaked in a 5wt% phytic acid aqueous solution for 25 minutes, then washed and dried to obtain pretreated basalt fiber; the mass-volume ratio of basalt fiber to phytic acid aqueous solution was 1g:10mL. A2. Disperse 7 parts aluminum nitrate, 8 parts isopropyl titanate, and 1.5 parts citric acid in anhydrous ethanol, then add water and 1.25 parts nitric acid sequentially to obtain a sol solution; wherein the mass ratio of aluminum nitrate, isopropyl titanate, and chelating agent to the volume of anhydrous ethanol is 1 g:10 mL; the mass ratio of aluminum nitrate and isopropyl titanate to the mass-volume ratio of water is 1 g:3 mL. A3. After mixing the pretreated basalt fiber with the sol solution at 85℃ for 50 min, filter, wash and dry to obtain TiO2-Al2O3 composite oxide modified basalt fiber. A method for preparing a high-strength plastic packaging material includes the following steps: randomly copolymerized polypropylene, polyolefin elastomer, block copolymerized polypropylene, polyethylene terephthalate and maleic anhydride grafted polypropylene are mixed evenly, TiO2-Al2O3 composite oxide modified basalt fiber and lubricant are added and mixed, and then blown into a film at 225°C to obtain the high-strength plastic packaging material.

[0029] Example 3 A high-strength plastic packaging material comprises the following raw materials in parts by weight: 80 parts of random copolymer polypropylene, 30 parts of polyolefin elastomer, 15 parts of block copolymer polypropylene, 15 parts of polyethylene terephthalate (intrinsic viscosity of 0.638 dL / g, model CZ-601), 12 parts of TiO2-Al2O3 composite oxide modified basalt fiber, 3 parts of zinc stearate, and 5 parts of maleic anhydride grafted polypropylene. The preparation method of TiO2-Al2O3 composite oxide modified basalt fiber includes the following steps: A1. 100 parts of basalt fiber were soaked in a 5wt% phytic acid aqueous solution for 30 minutes, then washed and dried to obtain pretreated basalt fiber; the mass-volume ratio of basalt fiber to phytic acid aqueous solution was 1g:10mL. A2. Disperse 13 parts aluminum nitrate, 2 parts isopropyl titanate, and 1.5 parts acetylacetone in anhydrous ethanol, then add water and 1.25 parts nitric acid sequentially to obtain a sol solution; wherein the mass ratio of aluminum nitrate, isopropyl titanate, and chelating agent to the volume of anhydrous ethanol is 1 g:10 mL; the mass ratio of aluminum nitrate and isopropyl titanate to the mass and volume of water is 1 g:3 mL. A3. After mixing the pretreated basalt fiber with the sol solution at 90℃ for 45 min, filter, wash and dry to obtain TiO2-Al2O3 composite oxide modified basalt fiber. A method for preparing a high-strength plastic packaging material includes the following steps: randomly copolymerized polypropylene, polyolefin elastomer, block copolymerized polypropylene, polyethylene terephthalate and maleic anhydride grafted polypropylene are mixed evenly, TiO2-Al2O3 composite oxide modified basalt fiber and lubricant are added and mixed, and then blown into a film at 230°C to obtain the high-strength plastic packaging material.

[0030] Example 4 Compared with Example 1, the only difference in this example is that the preparation method of TiO2-Al2O3 composite oxide modified basalt fiber in this example includes the following steps: A1. 100 parts of basalt fiber were soaked in a 5wt% phytic acid aqueous solution for 20 minutes, then washed and dried to obtain pretreated basalt fiber; the mass-volume ratio of basalt fiber to phytic acid aqueous solution was 1g:10mL. A2. Disperse 10 parts aluminum nitrate, 5 parts isopropyl titanate, and 1.5 parts acetylacetone in anhydrous ethanol, then add water and 1.25 parts nitric acid sequentially to obtain a sol solution; wherein the mass ratio of aluminum nitrate, isopropyl titanate, and chelating agent to the volume of anhydrous ethanol is 1 g:10 mL; the mass ratio of aluminum nitrate and isopropyl titanate to the mass-volume ratio of water is 1 g:3 mL. A3. After mixing the pretreated basalt fiber with the sol solution at 80℃ for 60 min, filter, wash and dry to obtain TiO2-Al2O3 composite oxide modified basalt fiber.

[0031] Example 5 Compared with Example 1, the only difference in this example is that the preparation method of TiO2-Al2O3 composite oxide modified basalt fiber in this example includes the following steps: A1. 100 parts of basalt fiber were soaked in a 5wt% phytic acid aqueous solution for 20 minutes, then washed and dried to obtain pretreated basalt fiber; the mass-volume ratio of basalt fiber to phytic acid aqueous solution was 1g:10mL. A2. Disperse 11.25 parts aluminum nitrate, 3.75 parts isopropyl titanate, and 1.5 parts acetylacetone in anhydrous ethanol, then add water and 1.25 parts nitric acid sequentially to obtain a sol solution; wherein the mass ratio of aluminum nitrate, isopropyl titanate, and chelating agent to the volume of anhydrous ethanol is 1 g:10 mL; the mass ratio of aluminum nitrate and isopropyl titanate to the mass-volume ratio of water is 1 g:3 mL; A3. After mixing the pretreated basalt fiber with the sol solution at 80℃ for 60 min, filter, wash and dry to obtain TiO2-Al2O3 composite oxide modified basalt fiber.

[0032] Example 6 Compared with Example 1, the only difference in this example is that in this example, polyethylene terephthalate is composed of a first polyethylene terephthalate (intrinsic viscosity of 0.638 dL / g, model CZ-601) and a second polyethylene terephthalate (intrinsic viscosity of 0.870 dL / g, model YS-C01) in a mass ratio of 1:2.5.

[0033] Example 7 Compared with Example 1, the only difference in this example is that, in this example, polyethylene terephthalate is composed of a first polyethylene terephthalate (intrinsic viscosity of 0.638 dL / g, model CZ-601) and a second polyethylene terephthalate (intrinsic viscosity of 0.870 dL / g, model YS-C01) in a mass ratio of 2:2.5.

[0034] Example 8 Compared with Example 1, the only difference in this example is that in this example, the polyethylene terephthalate is composed of a first polyethylene terephthalate (intrinsic viscosity of 0.638 dL / g, model CZ-601) and a second polyethylene terephthalate (intrinsic viscosity of 0.870 dL / g, model YS-C01) in a mass ratio of 3:2.5.

[0035] Example 9 Compared with Example 1, the only difference in this example is that the intrinsic viscosity of polyethylene terephthalate is 0.870 dL / g and the model is YS-C01.

[0036] Comparative Example 1 Compared with Example 1, the only difference in this comparative example is that the TiO2-Al2O3 composite oxide modified basalt fiber is replaced with an equal amount of basalt fiber.

[0037] Experimental Example 1 The plastic packaging materials prepared in Examples 1-5 and Comparative Example 1 were tested according to the test methods specified in standard GB / T 1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets". The specimen size was 180 mm × 10 mm, and the type was Type 2 specimen. The initial distance between the clamps was 100 mm, and the tensile speed was 500 mm / min. The tensile strength of the samples was tested. The test results are shown in Table 1. Table 1 Tensile strength test results of plastic packaging materials

[0038] The results in Table 1 show that the addition of TiO2-Al2O3 composite oxide modified basalt fiber, prepared from basalt fiber, aluminum nitrate and isopropyl titanate, to plastic packaging materials can improve the tensile strength of plastic packaging materials.

[0039] Experimental Example 2 The plastic packaging materials prepared in Examples 1, 6-9 were subjected to tear strength testing according to standard GB / T 16578.1-2008 "Determination of tear resistance of plastic films and sheets - Part 1: Pants tear test"; the test speed was 200 mm / min, and the test results are shown in Table 2. Table 2. Tear strength test results of plastic packaging materials

[0040] The results in Table 2 show that adding polyethylene terephthalate with different intrinsic viscosities to plastic packaging materials can improve the tear strength of plastic packaging materials.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength plastic packaging material, characterized in that, The raw materials include the following components by weight: 60-80 parts of random copolymer polypropylene, 20-30 parts of polyolefin elastomer, 10-15 parts of block copolymer polypropylene, 10-15 parts of polyethylene terephthalate, 8-12 parts of TiO2-Al2O3 composite oxide modified basalt fiber, 1-3 parts of lubricant, and 3-5 parts of compatibilizer; The TiO2-Al2O3 composite oxide modified basalt fiber comprises the following raw materials in parts by weight: 100 parts basalt fiber, 7-13 parts aluminum nitrate, and 2-8 parts isopropyl titanate.

2. The high-strength plastic packaging material according to claim 1, characterized in that, The mass ratio of aluminum nitrate to isopropyl titanate is 1~3:

1.

3. The high-strength plastic packaging material according to claim 1, characterized in that, The preparation method of the TiO2-Al2O3 composite oxide modified basalt fiber includes the following steps: A1. Basalt fiber is soaked in phytic acid aqueous solution, then washed and dried to obtain pretreated basalt fiber. A2. Disperse aluminum nitrate, isopropyl titanate, and chelating agent in a solvent, then add water and nitric acid in sequence to obtain a sol solution; A3. The pretreated basalt fiber is mixed with the sol solution, filtered, washed and dried to obtain the TiO2-Al2O3 composite oxide modified basalt fiber.

4. The high-strength plastic packaging material according to claim 3, characterized in that, The chelating agent includes one or both of acetylacetone and citric acid.

5. A high-strength plastic packaging material according to claim 3, characterized in that, In step A3, the mixing temperature is 80~100℃ and the time is 45~60min.

6. The high-strength plastic packaging material according to claim 1, characterized in that, The polyethylene terephthalate includes a first polyethylene terephthalate and a second polyethylene terephthalate; the first polyethylene terephthalate and the second polyethylene terephthalate have different intrinsic viscosities.

7. A high-strength plastic packaging material according to claim 6, characterized in that, The intrinsic viscosity of the first polyethylene terephthalate is 0.638~0.770 dL / g; the intrinsic viscosity of the second polyethylene terephthalate is 0.850~0.870 dL / g.

8. A high-strength plastic packaging material according to claim 7, characterized in that, The mass ratio of the first polyethylene terephthalate to the second polyethylene terephthalate is 1~3:2.

5.

9. A method for preparing a high-strength plastic packaging material, used to prepare a high-strength plastic packaging material as described in any one of claims 1 to 8, characterized in that, The process includes the following steps: after uniformly mixing random copolymer polypropylene, polyolefin elastomer, block copolymer polypropylene, polyethylene terephthalate and compatibilizer, TiO2-Al2O3 composite oxide modified basalt fiber and lubricant are added and mixed, and then molded to obtain the high-strength plastic packaging material.

10. A method for preparing a high-strength plastic packaging material according to claim 9, characterized in that, The molding process includes one of blown film molding and cast film molding; the temperature of blown film molding is 215~230℃.

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