A capsule material and a method for producing the same, a capsule, and an aerostat

Abstract

The application discloses a capsule material and a preparation method thereof, a capsule and a lighter, wherein the preparation method discloses a method for forming the capsule material by mixing weather-resistant barrier resins, inorganic additives and short fibers and the like functional materials together, uniformly dispersing, pre-solidifying and hot-pressing, so that the capsule material is integrated, the laminated adhesive interface is reduced, the performance of the obtained capsule material is more excellent, and the capsule material has the advantages of light weight and economy.

Description

Technical Field

[0001] This invention relates to the field of airship technology, and in particular to a capsule material and its preparation method, a capsule, and an airship. Background Technology

[0002] Near-space aerostats have broad applications in the airspace between aircraft and satellites, including Earth observation, missile early warning, and communication relay. As the main structural material for aerostats, the capsule material has become a research hotspot both domestically and internationally in recent years. Due to the harsh environment of near-space, including intense ultraviolet radiation, ozone, and fluctuating high and low temperatures, the capsule material must possess good weather resistance; the capsule is filled with a large amount of gas, requiring the material to have high strength and barrier properties.

[0003] Current capsule materials are composites consisting of a weather-resistant layer, a barrier layer, a load-bearing layer, an adhesive layer, and a heat-sealing layer, which can meet multiple performance requirements. However, this method of bonding and laminating multiple materials together always presents the problem of interfacial compatibility. Multiple materials bonded together create multiple interfaces, which are prone to delamination during processing and use, posing significant risks; furthermore, the weight of the capsule material increases considerably, leading to higher costs. Summary of the Invention

[0004] This invention provides a capsule material and its preparation method, a capsule, and a levitation device, which overcomes the defects of the prior art, such as easy delamination, large weight, and high cost caused by multi-layer bonding.

[0005] To achieve the above objectives, this invention proposes a method for preparing a capsule material, comprising the following steps:

[0006] S1: Weigh out the inorganic additives and short fibers, add them to the weather-resistant barrier resin solution, disperse them evenly, and obtain a mixture;

[0007] S2: The mixture is coated onto the substrate and pre-cured to obtain a cured film;

[0008] S3: The cured film is hot-pressed to obtain an integrally formed capsule material.

[0009] To achieve the above objectives, the present invention also proposes a capsule material, prepared by the above-described preparation method; the capsule material is integrally formed and has an areal density ≤120g / m³. 2 Tensile strength at break ≥ 800 N / cm, helium permeability ≤ 1 L / (m 2 .24h.atm).

[0010] To achieve the above objectives, the present invention also proposes a capsule, which is made of a capsule material prepared by the above-described preparation method or the capsule material described above.

[0011] To achieve the above objectives, the present invention also proposes an airship comprising the aforementioned capsule.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The preparation method of the capsule material provided by this invention abandons the traditional method of lamination and bonding of capsule materials. Instead, it mixes a variety of functional materials such as weather-resistant barrier resin, inorganic additives and short fibers together, disperses them evenly, pre-cures them and hot-presses them to obtain an integrated capsule material. The resin with dual functions of weather resistance and barrier is selected, and short fibers are used for reinforcement to reduce the amount of fiber. The preparation process is simple and reduces the lamination bonding interface, so that the obtained capsule material has better performance and has the advantages of lightweight and economy. Detailed Implementation

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

[0015] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0016] Unless otherwise specified, all medicines / reagents used are commercially available.

[0017] This invention proposes a method for preparing a capsule material, comprising the following steps:

[0018] S1: Weigh the inorganic additives and short fibers, add them to the weather-resistant barrier resin solution, disperse them evenly, and obtain a mixture.

[0019] S2: The mixture is coated onto the substrate and pre-cured to obtain a cured film.

[0020] S3: The cured film is hot-pressed to obtain an integrally formed capsule material.

[0021] Preferably, in step S1, the amount of the inorganic additive is 2-5% of the mass of the weather-resistant barrier resin solution; the amount of the short fiber is 15-30% of the mass of the weather-resistant barrier resin solution. Excessive use of the inorganic additive is intended to improve weather resistance, but it can negatively impact strength. Insufficient short fiber results in insufficient strength, while excessive use leads to excessive areal density.

[0022] Preferably, in step S1, the inorganic additive is at least one of titanium dioxide, zinc oxide, silicon dioxide, and graphene; the short fiber is at least one of aramid fiber, polyaryl ester fiber, ultra-high molecular weight polyethylene fiber, polyimide fiber, and PBO fiber. The inorganic additive can reflect sunlight or absorb ultraviolet rays, improving weather resistance. These fibers are lightweight and high-strength.

[0023] Preferably, in step S1, the diameter of the short fiber is 18–50 μm; the length of the short fiber is at least one of 19 mm and 9 mm. Short fibers are easy to process and disperse evenly; if they are too long, they cannot be dispersed, and if they are too short, they cannot provide reinforcement.

[0024] Preferably, in step S1, the concentration of weather-resistant barrier resin in the weather-resistant barrier resin solution is 20-50%; the weather-resistant barrier resin is at least one of polyamic acid and polyurethane prepolymer.

[0025] Preferably, in step S2, the pre-curing temperature is 80–100°C, and the time is 1–3 hours; the thickness of the cured film is 80–100 μm. Pre-curing allows the resin solution to form a wet film, initially removing the solvent and facilitating subsequent pressing and molding.

[0026] Preferably, in step S3, the hot pressing pressure is 10–15 MPa, the time is 1–2 h, and the temperature is 100–200 °C. The temperature is determined based on the molding temperature of the resin and the boiling point of the solvent, while the pressure and time are determined based on the properties of the capsule material.

[0027] This invention also proposes a capsule material, prepared by the above-described preparation method; the capsule material is integrally formed and has an areal density ≤120g / m³. 2 Tensile strength at break ≥ 800 N / cm, helium permeability ≤ 1 L / (m 2 .24h.atm).

[0028] The present invention also proposes a capsule, which is made of a capsule material prepared by the above-described preparation method or the capsule material described above.

[0029] The present invention also proposes an airship comprising the aforementioned capsule.

[0030] Example 1

[0031] This embodiment provides a method for preparing a capsule material, including the following steps:

[0032] At room temperature, 5g of titanium dioxide and 20g of polyarylate fiber with a diameter of 18μm and a specification of 9mm were added to 100g of polyamic acid solution and mixed for 5min at a dispersion speed of 2000r / min. The resulting 90μm membrane was coated onto a glass slide using a coater and then placed in a forced-air oven for curing at 90℃ for 2h. After pre-curing, the membrane was separated and then cured on a hot press at a pressure of 10MPa, a time of 1h, and a temperature of 150℃. After cooling, an integrated capsule material was obtained.

[0033] Example 2

[0034] This embodiment provides a method for preparing a capsule material, including the following steps:

[0035] At room temperature, 5g of silica and 20g of polyimide fibers with a diameter of 18μm and a specification of 9mm were added to 100g of polyamic acid solution and mixed for 5min at a dispersion speed of 2000r / min. A 90μm membrane was then coated onto a glass slide using a coater and placed in a forced-air oven to cure at 90℃ for 2h. After pre-curing, the membrane was separated and then cured on a hot press at a pressure of 10MPa, a time of 1h, and a temperature of 150℃. After cooling, an integrated capsule material was obtained.

[0036] Example 3

[0037] This embodiment provides a method for preparing a capsule material, including the following steps:

[0038] At room temperature, 5g of graphene and 20g of PBO fibers with a diameter of 18μm and a specification of 9mm were added to 100g of polyurethane prepolymer and mixed for 5min at a dispersion speed of 2000r / min. A 90μm membrane was then coated onto a glass slide using a coater and placed in a forced-air oven to cure at 90℃ for 2h. After pre-curing, the membrane was separated and then cured on a hot press at a pressure of 10MPa, a time of 1h, and a temperature of 200℃. After cooling, an integrated capsule material was obtained.

[0039] Example 4

[0040] This embodiment provides a method for preparing a capsule material, including the following steps:

[0041] At room temperature, 5g of zinc oxide and 20g of ultra-high molecular weight polyethylene fiber with a diameter of 18μm and a specification of 9mm were added to 100g of polyurethane prepolymer. The mixture was mixed for 5 minutes at a dispersion speed of 2000r / min. A 90μm membrane was then coated onto a glass slide using a coater. The film was then placed in a forced-air oven and cured at 100℃ for 2 hours. After pre-curing, the membrane was separated and then cured on a hot press at a pressure of 10MPa, a time of 1 hour, and a temperature of 180℃. After cooling, an integrated capsule material was obtained.

[0042] Comparative Example 1

[0043] This comparative example provides a method for preparing a capsule material, including the following steps:

[0044] A polyurethane film with added zinc oxide (10μm thickness) was selected as the weather-resistant film, a polyimide film (25μm thickness) as the barrier film, TPU hot melt adhesive as the adhesive, and ultra-high molecular weight polyethylene fiber woven fabric (110g / m²) as the load-bearing layer. 2 Then, from top to bottom, the coating and lamination are carried out in the order of weather-resistant film, adhesive, barrier film, adhesive and load-bearing layer, and finally laminated to obtain the capsule composite material.

[0045] Comparative Example 2

[0046] This comparative example provides a method for preparing a capsule material, including the following steps:

[0047] A polyurethane film with added silica (15μm thickness) was selected as the weather-resistant film, a polyimide film (25μm thickness) as the barrier film, TPU hot melt adhesive as the adhesive, and polyaryl fiber woven fabric (100g / m²) as the load-bearing layer. 2 Then, from top to bottom, the coating and lamination are carried out in the order of weather-resistant film, adhesive, barrier film, adhesive and load-bearing layer, and finally laminated to obtain the capsule composite material.

[0048] Comparative Example 3

[0049] This comparative example provides a method for preparing a capsule material, including the following steps:

[0050] A graphene-added polyimide film (10μm thick) was selected as the weather-resistant film, a polyurethane film (25μm thick) as the barrier film, TPU hot melt adhesive as the adhesive, and PBO fiber woven fabric (120g / m²) as the load-bearing layer. 2 Then, from top to bottom, the coating and lamination are carried out in the order of weather-resistant film, adhesive, barrier film, adhesive and load-bearing layer, and finally laminated to obtain the capsule composite material.

[0051] Comparative Example 4

[0052] This comparative example provides a method for preparing a capsule material, including the following steps:

[0053] The weather-resistant film (10μm thickness) is made of polyimide with added titanium dioxide, the barrier film (25μm thickness) is made of polyurethane film, the adhesive is TPU hot melt adhesive, and the load-bearing layer is aramid fiber woven fabric (area density 110g / m²). 2 Then, from top to bottom, the coating and lamination are carried out in the order of weather-resistant film, adhesive, barrier film, adhesive and load-bearing layer, and finally laminated to obtain the capsule composite material.

[0054] The capsule materials obtained in the above embodiments and comparative examples were tested for areal density, tensile strength at break, and helium permeability. Areal density was tested according to GB / T 4669-2008, tensile strength at break according to GB / T 8949-2008, and helium permeability according to GB / T 1038-2000. Performance comparisons are shown in the table below:

[0055]

[0056] As shown in the table above, the tensile strength of the capsule material prepared by the preparation method provided by the present invention is significantly improved, and the areal density and helium permeability are well controlled, which has broad application prospects in near-space airships.

[0057] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preparing a capsule material, characterized in that, Includes the following steps: S1: Weigh the inorganic additive and short fibers, add them to the weather-resistant barrier resin solution, and disperse them evenly to obtain a mixture; the inorganic additive is at least one of titanium dioxide, zinc oxide, silicon dioxide, and graphene; the short fibers are at least one of aramid fiber, polyaryl ester fiber, ultra-high molecular weight polyethylene fiber, polyimide fiber, and PBO fiber; the concentration of the weather-resistant barrier resin in the weather-resistant barrier resin solution is 20-50%; the weather-resistant barrier resin is at least one of polyamic acid and polyurethane prepolymer; the amount of the inorganic additive is 2-5% of the mass of the weather-resistant barrier resin solution; the amount of the short fibers is 15-30% of the mass of the weather-resistant barrier resin solution. S2: The mixture is coated onto a substrate and pre-cured to obtain a cured film; the pre-curing temperature is 80~100℃ and the time is 1-3h. S3: The cured film is hot-pressed, and the hot-pressing pressure is 10~15MPa, the time is 1~2h, and the temperature is 100~200℃ to obtain an integrally formed capsule material; The areal density of the capsule material is ≤120g / m³ 2 Tensile strength at break ≥ 800 N / cm, helium permeability ≤ 1 L / (m 2 .24h.atm).

2. The preparation method according to claim 1, characterized in that, In step S1, the diameter of the short fiber is 18~50μm; the length of the short fiber is at least one of 19mm and 9mm.

3. The preparation method according to claim 1, characterized in that, In step S2, the thickness of the cured film is 80~100μm.

4. A capsule material, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 3.

5. A capsule, characterized in that, The capsule is made of the capsule material described in claim 4.

6. An airship, characterized in that, Includes the capsule as described in claim 5.

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