High-temperature-resistant packaging film special for aviation and preparation method thereof

Abstract

The invention relates to the technical field of packaging films, and provides a high-temperature-resistant packaging film special for aviation and a preparation method thereof. The high-temperature-resistant packaging film special for aviation is prepared from the following raw materials in parts by weight: 70 to 80 parts of polyethylene resin, 2 to 3 parts of maleic anhydride grafted polyethylene, 10 to 15 parts of nano aluminum oxide modified basalt fiber, 12 to 14 parts of modified halloysite nanotube, 8 to 12 parts of liquid paraffin and 6 to 10 parts of antioxidant. The preparation method comprises the following steps: weighing the raw materials in proportion, mixing, carrying out blow molding, rolling and slitting. According to the high-temperature-resistant packaging film special for aviation, the structural integrity of the packaging film is kept under the high-temperature condition, physical properties such as strength and elongation also need to be ensured, and a high-performance and reliable packaging solution is provided for the field of aerospace.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging films, and in particular to a high-temperature resistant aviation-specific packaging film and a preparation method thereof. Background Art

[0002] In the aerospace field, many parts and products need to withstand extreme temperature conditions during transportation, storage and processing. Therefore, it is particularly important to develop a high-temperature resistant and high-performance aviation-specific packaging film. At present, there are many packaging films for the aviation field on the market, but these products often cannot meet the comprehensive requirements of high temperature resistance, high strength, corrosion resistance and good sealing at the same time. For example, although traditional polyethylene (PE) and polypropylene (PP) films are low in cost, they are easy to soften and deform in high temperature environments and cannot meet the high standards of the aerospace field.

[0003] Aerospace products often need to be stored or transported in an environment with a temperature of over 200°C or even higher, which poses a severe challenge to the high temperature resistance of packaging films. Under high temperature conditions, packaging films not only need to maintain their structural integrity, but also ensure that physical properties such as strength and elongation are not significantly reduced.

[0004] Based on this, the present invention proposes a high-temperature resistant aviation-specific packaging film and a preparation method thereof. Summary of the invention

[0005] The invention provides a high-temperature resistant aviation-specific packaging film and a preparation method thereof, which achieves stability under high-temperature conditions and ensures the mechanical strength of the packaging film.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a high temperature resistant aviation-specific packaging film, comprising the following raw materials in parts by weight: 70-80 parts of polyethylene resin, 2-3 parts of maleic anhydride grafted polyethylene, 10-15 parts of nano-alumina modified basalt fiber, 12-14 parts of modified halloysite nanotubes, 8-12 parts of liquid paraffin, and 6-10 parts of antioxidant.

[0007] As a further technical solution, the polyethylene resin includes high-density polyethylene and linear low-density polyethylene in a weight ratio of (4-5):1.

[0008] As a further technical solution, the preparation method of the nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 10-12 hours, then using deionized water to ultrasonically clean and dry to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol and ultrasonically dispersing it for 30-40 minutes, then adding a silane coupling agent and the pretreated basalt fiber, stirring at 60-70°C for 2-3 hours, and drying in a vacuum drying oven at 60°C for 12-14 hours to obtain the obtained basalt fiber.

[0009] As a further technical solution, the pretreatment step includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning it with deionized water for 3-5 times, and drying it in a vacuum drying oven at 60°C for 6-8 hours to obtain the pretreated basalt fiber.

[0010] As a further technical solution, the usage ratio of the nano-alumina, ethanol, water, silane coupling agent and pretreated basalt fiber is (0.4-0.6) g: (35-45) mL: (8-12) mL: (0.5-1.5) mL: (1.5-2.5) g.

[0011] As a further technical solution, the preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 55-65°C and adjusting the pH to 3-5 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, and filtering, washing and drying after the reaction to obtain the modified halloysite nanotubes.

[0012] As a further technical solution, the weight ratio of the halloysite nanotubes, toluene and methyltrimethoxysilane is (5-6): (100-110): (6.5-7.5).

[0013] As a further technical solution, the washing step is washing with ethanol for 3-5 times; and the drying step is drying in a vacuum drying oven at a temperature of 70-80°C for 10-12h.

[0014] As a further technical solution, the antioxidant includes at least one of triphenylphosphonic acid diester, tetra-tert-butylphenol acrylate and 2,6-di-tert-butyl-p-methylphenol.

[0015] In a second aspect, the present invention provides a method for preparing a high-temperature resistant aviation-specific packaging film, the steps comprising: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0016] The working principle and beneficial effects of the present invention are: 1. The present invention combines nano-alumina modified basalt fiber with modified halloysite nanotubes, and the two show a synergistic effect at the microscopic level; the unique tubular structure of the modified halloysite nanotubes provides additional attachment points for nano-alumina, enhances the uniformity of dispersion of nano-alumina on the fiber surface, avoids agglomeration, and further refines the microstructure of the fiber; this refined structure not only optimizes the stress transfer path between fibers, but also promotes the uniformity of stress distribution inside the packaging film, making the packaging film tougher and less likely to break when subjected to external forces.

[0017] 2. The nano-alumina in the present invention has a high melting point, high hardness and good thermal stability. By modifying basalt fiber, the stability of the packaging film under high temperature conditions can be effectively improved. The introduction of nano-alumina, through its chemical bonding and physical filling effect on the surface of basalt fiber, effectively reduces the gaps and defects between fibers and improves the density and continuity of the fibers; based on this, the combination of nano-alumina and basalt fiber forms a tighter interface structure, improves the interaction between the fiber and the matrix, and thus enhances the mechanical strength of the packaging film.

[0018] 3. The high specific surface area of ​​the modified halloysite nanotubes also significantly increases the specific surface area of ​​the packaging film, providing more diffusion barriers for gas molecules and effectively improving the gas barrier properties of the packaging film. Based on the high specific surface area and special tubular structure of the modified halloysite nanotubes, a large number of micro-nano structures are formed in the packaging film, which not only enhances the mechanical properties of the packaging film, but also improves its gas barrier properties and thermal stability. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 This embodiment provides a high temperature resistant aviation-specific packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 12 parts of nano-alumina modified basalt fiber, 13 parts of modified halloysite nanotubes, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 4 times, and drying it in a vacuum drying oven at 60°C for 7 hours to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 35 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 65°C for 2.5 hours, and drying it in a vacuum drying oven at 60°C for 13 hours to obtain the pretreated basalt fiber; the dosage ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.5g:40mL:10mL:1mL:2g; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 60°C and adding acetic acid to adjust the pH to 4 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 4 times, and drying in a vacuum drying oven at a temperature of 75°C for 11 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 5.5:105:7; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0021] Example 2 This embodiment provides a high temperature resistant aviation-specific packaging film, including the following raw materials in parts by weight: 70 parts of polyethylene resin, 2 parts of maleic anhydride grafted polyethylene, 10 parts of nano-alumina modified basalt fiber, 12 parts of modified halloysite nanotubes, 8 parts of liquid paraffin, and 6 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4:1; the antioxidant is tetra-tert-butylphenol acrylate; The preparation method of nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 3 times, and drying it in a vacuum drying oven at 60°C for 6 hours to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 30 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 60°C for 2 hours, and drying it in a vacuum drying oven at 60°C for 12 hours to obtain the pretreated basalt fiber; the dosage ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.4g:35mL:8mL:0.5mL:1.5g; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 55°C and adding acetic acid to adjust the pH to 3 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 3 times, and drying in a vacuum drying oven at a temperature of 70°C for 10 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 5:100:6.5; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0022] Example 3 This embodiment provides a high temperature resistant aviation-specific packaging film, including the following raw materials in parts by weight: 80 parts of polyethylene resin, 3 parts of maleic anhydride grafted polyethylene, 15 parts of nano-alumina modified basalt fiber, 14 parts of modified halloysite nanotubes, 12 parts of liquid paraffin, and 10 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 5 times, and drying it in a vacuum drying oven at 60°C for 8 hours to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 40 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 70°C for 3 hours, and drying it in a vacuum drying oven at 60°C for 14 hours to obtain the pretreated basalt fiber; the dosage ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.6g:45mL:12mL:1.5mL:2.5g; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 65°C and adding acetic acid to adjust the pH to 5 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 5 times, and drying in a vacuum drying oven at a temperature of 80°C for 12 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 6:110:7.5; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0023] Example 4 This embodiment provides a high temperature resistant aviation-specific packaging film, including the following raw materials in parts by weight: 70 parts of polyethylene resin, 3 parts of maleic anhydride grafted polyethylene, 10 parts of nano-alumina modified basalt fiber, 14 parts of modified halloysite nanotubes, 8 parts of liquid paraffin, and 10 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4:1; the antioxidant is 2,6-di-tert-butyl-p-methylphenol; The preparation method of nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 5 times, and drying it in a vacuum drying oven at 60°C for 6 hours to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 40 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 60°C for 3 hours, and drying it in a vacuum drying oven at 60°C for 12 hours to obtain the pretreated basalt fiber; the weight ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.6g:35mL:12mL:0.5mL:2.5g; The preparation method of the modified halloysite nanotubes comprises: mixing halloysite nanotubes and toluene, stirring at 55°C and adding acetic acid to adjust the pH to 5 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 3 times, and drying in a vacuum drying oven at 80°C for 10 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene and methyltrimethoxysilane is 6:100:7.5; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0024] Comparative Example 1 This comparative example provides a high temperature resistant aviation packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 12 parts of nano-silica modified basalt fiber, 13 parts of modified halloysite nanotubes, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of nano-silica modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 4 times, and drying it in a vacuum drying oven at 60°C for 7 hours to obtain the pretreated basalt fiber; adding nano-silica to an aqueous solution of ethanol for ultrasonic dispersion for 35 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 65°C for 2.5 hours, and drying it in a vacuum drying oven at 60°C for 13 hours to obtain the pretreated basalt fiber; the weight ratio of nano-silica, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.5g:40mL:10mL:1mL:2g; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 60°C and adding acetic acid to adjust the pH to 4 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 4 times, and drying in a vacuum drying oven at a temperature of 75°C for 11 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 5.5:105:7; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0025] Comparative Example 2 This comparative example provides a high temperature resistant aviation packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 12 parts of nano-alumina modified glass fiber, 13 parts of modified halloysite nanotubes, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of nano-alumina modified glass fiber includes: extracting the glass fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning it with deionized water for 4 times, and drying it in a vacuum drying oven at 60°C for 7 hours to obtain the pretreated glass fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 35 minutes, then adding silane coupling agent KH560 and the pretreated glass fiber, stirring at 65°C for 2.5 hours, and drying it in a vacuum drying oven at 60°C for 13 hours to obtain the glass fiber; the weight ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and the pretreated glass fiber is 0.5g:40mL:10mL:1mL:2g; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 60°C and adding acetic acid to adjust the pH to 4 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 4 times, and drying in a vacuum drying oven at a temperature of 75°C for 11 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 5.5:105:7; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0026] Comparative Example 3 This comparative example provides a high temperature resistant aviation packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 12 parts of basalt fiber, 13 parts of modified halloysite nanotubes, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The basalt fiber is a pretreated basalt fiber, and the treatment steps include: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 4 times, and drying the pretreated basalt fiber in a vacuum drying oven at 60° C. for 7 hours; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 60°C and adding acetic acid to adjust the pH to 4 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 4 times, and drying in a vacuum drying oven at a temperature of 75°C for 11 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 5.5:105:7; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0027] Comparative Example 4 This comparative example provides a high temperature resistant aviation packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 13 parts of modified halloysite nanotubes, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of the modified halloysite nanotubes includes: mixing halloysite nanotubes and toluene, stirring at 60°C and adding acetic acid to adjust the pH to 4 to obtain a mixed solution A; adding methyltrimethoxysilane to the mixed solution A for reaction, filtering after the reaction, washing with ethanol for 4 times, and drying in a vacuum drying oven at a temperature of 75°C for 11 hours to obtain the modified halloysite nanotubes; the weight ratio of the halloysite nanotubes, toluene, and methyltrimethoxysilane is 5.5:105:7; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0028] Comparative Example 5 This comparative example provides a high temperature resistant aviation packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 12 parts of nano-alumina modified basalt fiber, 13 parts of halloysite nanotubes, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 4 times, and drying it in a vacuum drying oven at 60°C for 7 hours to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 35 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 65°C for 2.5 hours, and drying it in a vacuum drying oven at 60°C for 13 hours to obtain the pretreated basalt fiber; the weight ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.5g:40mL:10mL:1mL:2g; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0029] Comparative Example 6 This comparative example provides a high temperature resistant aviation packaging film, including the following raw materials in parts by weight: 75 parts of polyethylene resin, 2.5 parts of maleic anhydride grafted polyethylene, 12 parts of nano-alumina modified basalt fiber, 10 parts of liquid paraffin, and 8 parts of antioxidant; The polyethylene resin includes high-density polyethylene HDPE-30460M and linear low-density polyethylene LLDPE DNDA-7147 in a weight ratio of 4.5:1; the antioxidant is triphenylphosphonic acid diester; The preparation method of nano-alumina modified basalt fiber includes: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning the basalt fiber with deionized water for 4 times, and drying it in a vacuum drying oven at 60°C for 7 hours to obtain the pretreated basalt fiber; adding nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 35 minutes, then adding silane coupling agent KH560 and the pretreated basalt fiber, stirring at 65°C for 2.5 hours, and drying it in a vacuum drying oven at 60°C for 13 hours to obtain the pretreated basalt fiber; the weight ratio of nano-alumina, ethanol, water, silane coupling agent KH560 and pretreated basalt fiber is 0.5g:40mL:10mL:1mL:2g; The preparation method of the high temperature resistant aviation-specific packaging film in this embodiment comprises the following steps: weighing raw materials in proportion and mixing, blow molding, winding, and slitting.

[0030] Test Example 1: Mechanical properties: The tensile strength and elongation at break were measured using a WDW100 universal testing machine; Oxygen permeability: Determine oxygen permeability according to GB / T10004-2008; The properties of the high temperature resistant aviation packaging films prepared in the above Examples 1-4 and Comparative Examples 1-6 were tested, and the results are shown in Table 1: Table 1

[0031] The above are only 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 in the protection scope of the present invention.

Claims

1. A high temperature resistant aviation packaging film, characterized in that: It includes the following raw materials in parts by weight: 70-80 parts of polyethylene resin, 2-3 parts of maleic anhydride grafted polyethylene, 10-15 parts of nano-alumina modified basalt fiber, 12-14 parts of modified halloysite nanotubes, 8-12 parts of liquid paraffin, and 6-10 parts of antioxidant.

2. The high temperature resistant aviation packaging film according to claim 1, characterized in that: The polyethylene resin comprises high-density polyethylene and linear low-density polyethylene in a weight ratio of (4-5):

1.

3. The high temperature resistant aviation packaging film according to claim 1, characterized in that: The preparation method of the nano-alumina modified basalt fiber comprises: extracting the basalt fiber with acetone in a Soxhlet extractor for 10-12 hours, then using deionized water for ultrasonic cleaning and drying to obtain the pretreated basalt fiber; adding the nano-alumina to an aqueous solution of ethanol for ultrasonic dispersion for 30-40 minutes, then adding a silane coupling agent and the pretreated basalt fiber, stirring at 60-70° C. for 2-3 hours, and drying in a vacuum drying oven at 60° C. for 12-14 hours to obtain the basalt fiber.

4. The high temperature resistant aviation packaging film according to claim 3, characterized in that: The pretreatment step comprises: extracting the basalt fiber with acetone in a Soxhlet extractor for 12 hours, then ultrasonically cleaning it with deionized water for 3-5 times, and drying it in a vacuum drying oven at 60° C. for 6-8 hours to obtain the pretreated basalt fiber.

5. The high temperature resistant aviation packaging film according to claim 3, characterized in that: The dosage ratio of the nano-alumina, ethanol, water, silane coupling agent and pretreated basalt fiber is (0.4-0.6) g: (35-45) mL: (8-12) mL: (0.5-1.5) mL: (1.5-2.5) g.

6. The high temperature resistant aviation packaging film according to claim 1, characterized in that: The preparation method of the modified halloysite nanotubes comprises: mixing halloysite nanotubes and toluene, stirring at 55-65° C. and adjusting the pH to 3-5 to obtain a mixed solution A; adding methyltrimethoxysilane into the mixed solution A for reaction, and filtering, washing and drying after the reaction to obtain the modified halloysite nanotubes.

7. The high temperature resistant aviation packaging film according to claim 6, characterized in that: The weight ratio of the halloysite nanotubes, toluene and methyltrimethoxysilane is (5-6): (100-110): (6.5-7.5).

8. The high temperature resistant aviation packaging film according to claim 6, characterized in that: The washing step comprises washing with ethanol for 3-5 times; and the drying step comprises drying in a vacuum drying oven at a temperature of 70-80° C. for 10-12 hours.

9. The high temperature resistant aviation packaging film according to claim 1, characterized in that: The antioxidant includes at least one of triphenylphosphonic acid diester, tetra-tert-butylphenol acrylate and 2,6-di-tert-butyl-p-methylphenol.

10. A method for preparing a high temperature resistant aviation-specific packaging film according to any one of claims 1 to 9, characterized in that: The steps include: Weigh the raw materials according to the proportion and mix them, blow mold them, roll them up and cut them into pieces.

Images