Preparation method of ultralight high-strength radiation-resistant cushion packaging material

Abstract

The invention relates to a preparation method of an ultralight high-strength radiation-resistant cushion packaging material, and belongs to the technical field of packaging materials. The preparation method comprises the following steps: adding pyromellitic polyimide resin into an N, N-dimethylformamide solvent, and stirring for dissolving to form a resin solution; adding carbon nanofibers into the resin solution, performing ultrasonic dispersion, sequentially adding lead oxide, azodicarbonamide, a reinforcing dispersant and dibutyl phthalate, and stirring and mixing to obtain a mixed solution; carrying out extrusion molding on the mixed solution through a screw extruder; putting the formed blank into a drying oven, and carrying out foaming treatment; curing the foaming material in a high-temperature environment, naturally cooling to room temperature, and demolding to obtain the ultra-light high-strength radiation-resistant cushion packaging material for aerospace equipment. The packaging material prepared by the invention has the characteristics of ultralight weight, higher tensile strength and excellent radiation resistance and buffering performance.

Description

Technical Field

[0001] The invention relates to the technical field of packaging materials, in particular to a method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material. Background Art

[0002] In the aerospace field, equipment faces complex and demanding environmental conditions, such as cosmic ray radiation, drastic temperature fluctuations, and mechanical vibration. This requires packaging materials that are ultra-lightweight, high-strength, radiation-resistant, and possess excellent cushioning properties to ensure the safety and integrity of aerospace equipment during transportation, storage, and use. Polyimide, due to its excellent comprehensive properties, is an ideal choice for such packaging materials. Through specific formulation design and process optimization, its performance can be further enhanced to meet the specific requirements of aerospace equipment.

[0003] Chinese patent CN119331419A discloses an impact-resistant plastic packaging material and its preparation method, relating to the field of plastics technology. The present invention comprises the following steps: first, reacting single-end hydrogen silicone oil with 3-vinylphenol to produce modified silicone oil; grafting polystyrene with acryloyl chloride; reacting the grafted polystyrene with bis(trimethylsilyl)phosphine; reacting the grafted polystyrene with methyl parafluorobenzoate; hydrolyzing the grafted polystyrene with sodium hydroxide; and finally reacting the grafted polystyrene with the modified silicone oil to produce modified polystyrene; second, reacting acryloyl chloride with sodium lignin sulfonate to produce modified sodium lignin sulfonate; reacting pretreated mica with the modified sodium lignin sulfonate; sulfonation and chlorination; and finally reacting the grafted polystyrene with methylguanidine hydrochloride to produce modified mica; and finally, mixing the modified polystyrene, modified mica, and azobisisobutyronitrile and hot pressing the resulting impact-resistant plastic packaging material.

[0004] Chinese patent CN119307032A: discloses an antibacterial plastic packaging material and a preparation method thereof, relating to the technical field of packaging materials. The packaging material is made of the following components by weight: 90-120 parts of plastic resin, 10-20 parts of maleic anhydride grafted polyethylene, 5-15 parts of poly(p-phenylene amide) fiber, 4-12 parts of modified titanium dioxide, 3-10 parts of polyvinyl alcohol, 1-3 parts of coupling agent, 1-3 parts of lubricant, and 1-3 parts of plasticizer.

[0005] Chinese patent CN115073897B: relates to the C08L field, specifically a degradable plastic packaging material and its preparation process, using 80-120 parts of aliphatic polymer, 10-20 parts of plant starch, 15-25 parts of inorganic powder filler, 1-5 parts of chitosan and its derivatives, and 1-5 parts of functional additives.

[0006] Plastic packaging materials produced using existing technologies are lightweight and relatively flexible, but they are relatively weak and prone to cracking when subjected to significant mechanical stress. Furthermore, most plastics have poor heat resistance and are unable to withstand the high temperatures encountered in aerospace equipment. Furthermore, plastics are unstable in radiation environments and are prone to degradation and aging, resulting in material performance degradation and an inability to effectively protect the equipment within. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material, the operating steps of which are as follows:

[0008] S1: Mixing and dispersing: Add 20-40 parts of phenylene polyimide resin to 60-80 parts of N,N-dimethylformamide solvent, stir and dissolve to form a uniform resin solution; add 5-10 parts of nano-carbon fibers to the resin solution, and ultrasonically disperse for 30-60 minutes to ensure that the reinforcing filler is evenly dispersed and avoid agglomeration; add 3-5 parts of lead oxide radiation protectant, 1-3 parts of azodicarbonamide foaming agent, 0.1-0.5 parts of reinforcing dispersant, and 2-4 parts of dibutyl phthalate plasticizer in sequence, and continue stirring for 30-45 minutes to ensure that the components are fully mixed to obtain a mixed solution;

[0009] S2 molding process: the mixed solution is extruded into a mold by a twin-screw extruder;

[0010] S3 Foaming treatment: Place the formed body into an oven for foaming treatment to decompose and generate gas, forming a uniform and fine cell structure;

[0011] S4 curing treatment: The foaming material is cured in a high-temperature environment to promote further cross-linking of the polyimide resin molecular chains and strengthen the interface bonding between the filler and the matrix; after curing, it is naturally cooled to room temperature and demoulded to obtain an ultra-light, high-strength, radiation-resistant cushioning packaging material for aerospace equipment.

[0012] Furthermore, the temperature of the screw extruder is 250-350°C.

[0013] Furthermore, the foaming treatment temperature is 150-200° C. and the time is 30-60 minutes.

[0014] Furthermore, the curing treatment temperature is 300-400° C. and the time is 180-240 minutes.

[0015] Furthermore, the preparation method of the enhanced dispersant is:

[0016] In parts by mass, 20-40 parts of 4,4'-diaminodiphenylmethane, 23-46 parts of 6-methyl-1,3,5-triazine-2,4-diamine, 1.5-3 parts of allylphenyl sulfide, and 2-5 parts of ethylenediamine are added to 200-300 parts of dichloromethane, and the mixture is reacted at 70-80°C for 2-4 hours; the dichloromethane is removed by distillation under reduced pressure to obtain an enhanced dispersant.

[0017] Reaction mechanism

[0018] Initial cross-linking: Under the catalysis of ethylenediamine, the amino group of 4,4'-diaminodiphenylmethane attacks the triazine ring carbon atom of 6-methyl-1,3,5-triazine-2,4-diamine, and a cross-linking intermediate is formed through nucleophilic addition and proton transfer.

[0019] Amino-allyl addition: The intermediate amino group, catalyzed by ethylenediamine, attacks the allyl π bond of allylphenyl sulfide, undergoing nucleophilic addition and introducing it into the network to form the target additive.

[0020] Technical Effects

[0021] The present invention provides a method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material. Compared with the prior art, the present invention has the following significant effects:

[0022] 1. Ultra-light features can reduce launch costs: In the aerospace field, launch costs are closely related to the weight of the spacecraft. Ultra-light packaging materials can effectively reduce the overall weight of the equipment and save considerable launch fuel costs. This allows spacecraft to carry more scientific exploration equipment or materials without increasing excessive costs, thereby improving the overall effectiveness of the mission.

[0023] 2. High strength performance

[0024] The cross-linked network structure formed by 4,4'-diaminodiphenylmethane and 6-methyl-1,3,5-triazine-2,4-diamine has high strength and stability; the introduction of allyl phenyl sulfide further enhances the intermolecular forces, making the bond between the additive molecules and the matrix material (such as the homophenylene polyimide resin) tighter; this close bond and cross-linked structure can effectively improve the strength and toughness of the cushioning packaging material, enabling it to withstand greater impact and pressure.

[0025] 3. Radiation resistance

[0026] The sulfur element in allyl phenyl sulfide has a certain ability to absorb and scatter radiation. When the cushioning packaging material is exposed to radiation, the sulfur atoms can absorb part of the radiation energy, reducing the damage to the internal structure of the material and aerospace equipment. At the same time, the network structure of the additive can also block the penetration of radiation to a certain extent, improving the radiation resistance of the material.

[0027] 4. Excellent cushioning performance reduces vibration transmission:

[0028] Mechanical vibrations during launch and space operations can adversely affect equipment. Good cushioning packaging materials can block the transmission of vibrations, reducing the equipment's response amplitude in vibrating environments, ensuring the equipment continues to function properly in these environments and improving operational stability. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention object, the following is a detailed description in conjunction with examples and comparative examples:

[0030] 1. Density test: Use the drainage method to measure the density of the material.

[0031] 2. Tensile strength test: Use a universal material testing machine to test the tensile strength of the material.

[0032] 3. Radiation resistance test: The material is irradiated with gamma rays at a dose of 100 kGy to test the change in tensile strength of the material before and after irradiation and evaluate its radiation resistance.

[0033] 4. Cushioning performance test: A universal material testing machine equipped with a dynamic loading device and a displacement sensor was used; the drop weight was 5 kg, the drop height was 0.5 m, the recovery time was 60 s, and the impact was repeated five times in a row. The recovery rate was calculated as follows: (recovered size - initial size) / (maximum deformation size - initial size) × 100%.

[0034] Example 1

[0035] A method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material, the operating steps of which are as follows:

[0036] S1 Mixing and Dispersion: Add 20g of phenylene polyimide resin to 60g of N,N-dimethylformamide solvent, stir and dissolve to form a uniform resin solution; add 5g of nano-carbon fiber to the resin solution, and ultrasonically disperse for 30 minutes to ensure that the reinforcing filler is evenly dispersed and avoid agglomeration; add 3g of lead oxide radiation protector, 1g of azodicarbonamide foaming agent, 0.1g of reinforcing dispersant, and 2g of dibutyl phthalate plasticizer in sequence, and continue stirring for 30 minutes to ensure that the ingredients are fully mixed to obtain a mixed solution;

[0037] S2 molding process: the mixed solution is extruded into a mold by a twin-screw extruder;

[0038] S3 Foaming treatment: Place the formed body into an oven for foaming treatment to decompose and generate gas, forming a uniform and fine cell structure;

[0039] S4 curing treatment: The foaming material is cured in a high-temperature environment to promote further cross-linking of the polyimide resin molecular chains and strengthen the interface bonding between the filler and the matrix; after curing, it is naturally cooled to room temperature and demoulded to obtain an ultra-light, high-strength, radiation-resistant cushioning packaging material for aerospace equipment.

[0040] The temperature of the screw extruder is 250°C.

[0041] The foaming treatment temperature is 150° C. and the time is 30 minutes.

[0042] The curing temperature is 300° C. and the curing time is 180 minutes.

[0043] The preparation method of the enhanced dispersant is:

[0044] 20 g of 4,4'-diaminodiphenylmethane, 23 g of 6-methyl-1,3,5-triazine-2,4-diamine (CAS: 542-02-9), 1.5 g of allylphenyl sulfide, and 2 g of ethylenediamine were added to 200 g of dichloromethane, and the mixture was reacted at 70°C for 2 hours. The dichloromethane was removed by distillation under reduced pressure to obtain an enhanced dispersant.

[0045] Example 2

[0046] A method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material, the operating steps of which are as follows:

[0047] S1 Mixing and Dispersion: Add 25g of phenylene polyimide resin to 65g of N,N-dimethylformamide solvent, stir and dissolve to form a uniform resin solution; add 6g of nano-carbon fibers to the resin solution, and ultrasonically disperse for 40 minutes to ensure that the reinforcing filler is evenly dispersed and avoid agglomeration; add 3-5g of lead oxide radiation protectant, 2g of azodicarbonamide foaming agent, 0.2g of reinforcing dispersant, and 3g of dibutyl phthalate plasticizer in sequence, and continue stirring for 35 minutes to ensure that the ingredients are fully mixed to obtain a mixed solution;

[0048] S2 molding process: the mixed solution is extruded into a mold by a twin-screw extruder;

[0049] S3 Foaming treatment: Place the formed body into an oven for foaming treatment to decompose and generate gas, forming a uniform and fine cell structure;

[0050] S4 curing treatment: The foaming material is cured in a high-temperature environment to promote further cross-linking of the polyimide resin molecular chains and strengthen the interface bonding between the filler and the matrix; after curing, it is naturally cooled to room temperature and demoulded to obtain an ultra-light, high-strength, radiation-resistant cushioning packaging material for aerospace equipment.

[0051] The temperature of the screw extruder is 280°C.

[0052] The foaming treatment temperature is 160° C. and the time is 40 minutes.

[0053] The curing treatment temperature is 340° C. and the time is 200 minutes.

[0054] The preparation method of the enhanced dispersant is:

[0055] 25 g of 4,4'-diaminodiphenylmethane, 30 g of 6-methyl-1,3,5-triazine-2,4-diamine CAS: 542-02-9, 2 g of allylphenyl sulfide, and 3 g of ethylenediamine were added to 240 g of dichloromethane, and the mixture was reacted at 75°C for 3 hours. The dichloromethane was removed by distillation under reduced pressure to obtain an enhanced dispersant.

[0056] Example 3

[0057] A method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material, the operating steps of which are as follows:

[0058] S1 Mixing and Dispersion: Add 35g of phenylene polyimide resin to 75g of N,N-dimethylformamide solvent, stir and dissolve to form a uniform resin solution; add 8g of nano-carbon fiber to the resin solution, and ultrasonically disperse for 50 minutes to ensure that the reinforcing filler is evenly dispersed and avoid agglomeration; add 4g of lead oxide radiation protector, 2g of azodicarbonamide foaming agent, 0.4g of reinforcing dispersant, and 3g of dibutyl phthalate plasticizer in sequence, and continue stirring for 40 minutes to ensure that the ingredients are fully mixed to obtain a mixed solution;

[0059] S2 molding process: the mixed solution is extruded into a mold by a twin-screw extruder;

[0060] S3 Foaming treatment: Place the formed body into an oven for foaming treatment to decompose and generate gas, forming a uniform and fine cell structure;

[0061] S4 curing treatment: The foaming material is cured in a high-temperature environment to promote further cross-linking of the polyimide resin molecular chains and strengthen the interface bonding between the filler and the matrix; after curing, it is naturally cooled to room temperature and demoulded to obtain an ultra-light, high-strength, radiation-resistant cushioning packaging material for aerospace equipment.

[0062] The temperature of the screw extruder is 330°C.

[0063] The foaming treatment temperature is 180° C. and the time is 50 minutes.

[0064] The curing temperature is 380° C. and the curing time is 220 minutes.

[0065] The preparation method of the enhanced dispersant is:

[0066] 35 g of 4,4'-diaminodiphenylmethane, 40 g of 6-methyl-1,3,5-triazine-2,4-diamine CAS: 542-02-9, 2.5 g of allylphenyl sulfide, and 4 g of ethylenediamine were added to 280 g of dichloromethane, and the mixture was reacted at 75°C for 3 hours. The dichloromethane was removed by distillation under reduced pressure to obtain an enhanced dispersant.

[0067] Example 4

[0068] A method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material, the operating steps of which are as follows:

[0069] S1 Mixing and Dispersion: Add 40g of phenylene polyimide resin to 80g of N,N-dimethylformamide solvent, stir and dissolve to form a uniform resin solution; add 10g of nano-carbon fibers to the resin solution, and ultrasonically disperse for 60 minutes to ensure that the reinforcing filler is evenly dispersed and avoid agglomeration; add 5g of lead oxide radiation protector, 3g of azodicarbonamide foaming agent, 0.5g of reinforcing dispersant, and 4g of dibutyl phthalate plasticizer in sequence, and continue stirring for 45 minutes to ensure that the ingredients are fully mixed to obtain a mixed solution;

[0070] S2 molding process: the mixed solution is extruded into a mold by a twin-screw extruder;

[0071] S3 Foaming treatment: Place the formed body into an oven for foaming treatment to decompose and generate gas, forming a uniform and fine cell structure;

[0072] S4 curing treatment: The foaming material is cured in a high-temperature environment to promote further cross-linking of the polyimide resin molecular chains and strengthen the interface bonding between the filler and the matrix; after curing, it is naturally cooled to room temperature and demoulded to obtain an ultra-light, high-strength, radiation-resistant cushioning packaging material for aerospace equipment.

[0073] The temperature of the screw extruder is 350°C.

[0074] The foaming treatment temperature is 200° C. and the time is 60 minutes.

[0075] The curing temperature is 400° C. and the curing time is 240 minutes.

[0076] The preparation method of the enhanced dispersant is:

[0077] 40 g of 4,4'-diaminodiphenylmethane, 46 g of 6-methyl-1,3,5-triazine-2,4-diamine (CAS: 542-02-9), 3 g of allylphenyl sulfide, and 5 g of ethylenediamine were added to 300 g of dichloromethane, and the mixture was reacted at 80°C for 4 hours. The dichloromethane was removed by distillation under reduced pressure to obtain an enhanced dispersant.

[0078] Comparative Example 1

[0079] No reinforcing dispersant was added, and the other procedures were the same as in Example 1.

[0080] Comparative Example 2

[0081] The other steps were the same as in Example 1 except that 4,4'-diaminodiphenylmethane was not added.

[0082] Comparative Example 3

[0083] The other steps were the same as in Example 1 except that 6-methyl-1,3,5-triazine-2,4-diamine was not added.

[0084] Table 1: Test results of examples and comparative examples

[0085]

[0086] Through the data analysis of the above embodiments and comparative examples, the packaging material prepared by the present invention has ultra-light characteristics, high tensile strength, excellent radiation resistance and cushioning performance.

[0087] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material, the operating steps of which are as follows: S1: Mixing and dispersing: Add 20-40 parts of phenylene polyimide resin to 60-80 parts of N,N-dimethylformamide solvent, stir and dissolve to form a uniform resin solution; add 5-10 parts of nano-carbon fibers to the resin solution, and ultrasonically disperse for 30-60 minutes to ensure that the reinforcing filler is evenly dispersed and avoid agglomeration; add 3-5 parts of lead oxide radiation protectant, 1-3 parts of azodicarbonamide foaming agent, 0.1-0.5 parts of reinforcing dispersant, and 2-4 parts of dibutyl phthalate plasticizer in sequence, and continue stirring for 30-45 minutes to ensure that the components are fully mixed to obtain a mixed solution; S2 molding process: the mixed solution is extruded into a mold by a twin-screw extruder; S3 Foaming treatment: Place the formed body into an oven for foaming treatment to decompose and generate gas, forming a uniform and fine cell structure; S4 curing treatment: The foaming material is cured in a high temperature environment to promote further cross-linking of the polyimide resin molecular chains and strengthen the interface bonding between the filler and the matrix; after curing, it is naturally cooled to room temperature and demoulded to obtain an ultra-light, high-strength, radiation-resistant cushioning packaging material; The enhanced dispersant is prepared by reacting 4,4'-diaminodiphenylmethane, 6-methyl-1,3,5-triazine-2,4-diamine, allylphenyl sulfide and ethylenediamine.

2. The method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material according to claim 1, characterized in that: The temperature of the screw extruder is 250-350°C.

3. The method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material according to claim 1, characterized in that: The foaming treatment temperature is 150-200° C. and the time is 30-60 minutes.

4. The method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material according to claim 1, characterized in that: The curing treatment temperature is 300-400° C. and the time is 180-240 minutes.

5. The method for preparing an ultra-light, high-strength, radiation-resistant cushioning packaging material according to claim 1, characterized in that: The preparation method of the enhanced dispersant is: In parts by mass, 20-40 parts of 4,4'-diaminodiphenylmethane, 23-46 parts of 6-methyl-1,3,5-triazine-2,4-diamine, 1.5-3 parts of allylphenyl sulfide, and 2-5 parts of ethylenediamine are added to 200-300 parts of dichloromethane, and the mixture is reacted at 70-80°C for 2-4 hours; the dichloromethane is removed by distillation under reduced pressure to obtain an enhanced dispersant.

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