High-strength light-weight capsule material

Abstract

The invention discloses a high-strength light-weight capsule material which is a hose with a two-layer structure and comprises a reinforcement body and an air-tight liner lining rubber tube, and the reinforcement body is formed by weaving aramid filament flat strips subjected to flattening processing as warp and weft tows. The thickness of reinforcement bodies of the same specification is effectively reduced, and the fiber strength utilization rate is effectively increased; the bonding performance of the lining rubber pipe and the reinforcement body is improved; the relatively high air tightness can be realized by adopting the relatively thin inner liner rubber tube; and the bonding effect between the flat aramid fiber tows and the TPU is effectively enhanced.

Description

Technical Field

[0001] This invention belongs to the field of special materials, specifically relating to a high-strength, lightweight capsule material. Background Technology

[0002] The rocket fairing separation gasbag is a key component ensuring the separation of the rocket fairing. Before separation, it is in a compressed, flat state. When the rocket exits the atmosphere, the pyrotechnics inside the gasbag are ignited, and the large amount of gas generated by the explosion causes the gasbag to expand instantaneously, thus achieving fairing separation. The strength and weight of the rocket fairing separation gasbag are the main factors affecting its performance. Currently, the reinforcement is mainly woven using a conventional circular loom with a water hose process, followed by an internal vulcanization process to give the gasbag airtightness. Existing processes suffer from problems such as large reinforcement thickness, low fiber strength utilization, poor adhesion between the airtight layer and the reinforcement, and a large airtight layer, resulting in significant overall strength and weight. For major spacecraft components, it is essential to optimize their structure to achieve high strength and lightweight design. Summary of the Invention

[0003] The purpose of this invention is to provide a high-strength, lightweight capsule material and its preparation method based on existing technology.

[0004] The objective of this invention can be achieved through the following measures: The high-strength, lightweight capsule material of this invention is a two-layer structure hose, including a reinforcing body and an airtight inner lining tubing. The reinforcing body is woven from flattened aramid filament strips as warp and weft bundles.

[0005] The inner diameter of the hose of the present invention is preferably 50-600 mm. In the two-layer hose structure, the reinforcement is on the outer layer, and the airtight inner lining is on the inner layer, which are bonded together by TPU.

[0006] The warp and weft bundles of the high-strength, lightweight capsule material reinforcement of this invention are flat aramid filament strips that have undergone flattening processing.

[0007] The warp and weft yarns used in this invention are para-aramid filaments with specifications of 1500D-9000D. After improved airflow flattening treatment, high-energy particle surface treatment, and finally co-extrusion-multi-stage cooling, thermoplastic polyurethane (TPU) shaped aramid filament flat strips are prepared. The width of the aramid filament flat strips is 2mm-10mm and the thickness is 0.2-0.5mm.

[0008] The improved airflow flattening process referred to in this invention is based on the existing airflow flattening process, which adds a stabilizing guide roller to control the width of the airflow disturbance zone, reduce fiber disturbance before the fiber contacts the rear roller, and ensure the stability of the flattening process.

[0009] Existing airflow flattening solutions mainly consist of airflow nozzles, fiber bundle channels, and a rear roller. Their core principle is to achieve flattening by laterally shearing and dispersing the fiber bundles using high-speed airflow. However, this solution suffers from a large airflow disturbance zone and a lack of constraint on the fiber bundles before contact with the rear roller, resulting in lateral fiber offsets of 1-2 mm and fiber bundle flatness deviations exceeding 5%, affecting the consistency of fiber arrangement during subsequent weaving.

[0010] The improved solution of this invention adds a stabilizing guide roller structure to the existing structure, and the specific optimizations are as follows: Structural optimization: A set of stabilizing guide rollers is added before and after the airflow nozzle, with a guide roller spacing of 50-60mm, forming a constraint path of "nozzle-guide roller-rear roller", controlling the width of the airflow disturbance zone to 5-8mm, and the lateral offset of the fiber bundle before contact with the rear roller is ≤0.5mm.

[0011] Improved stability: The guide rollers mechanically restrict the irregular shaking of the fiber bundles, and together with the heating module and softening sizing agent in the airflow flattening process, the fibers are evenly spread out under the action of airflow.

[0012] The improved airflow flattening process of the present invention reduces fiber disturbance before the fiber contacts the rear roller by controlling the width of the airflow disturbance zone, thereby ensuring the stability of the flattening process.

[0013] The high-energy particle surface treatment of the present invention generates high-energy particles by inserting a ceramic insulating plate between high-frequency and high-voltage electrode plates. The flat aramid filament bundle is uniformly acted upon by the high-energy particles between the electrodes, which can micro-etch the fiber surface in the flat aramid filament bundle. At the same time, oxygen-containing groups are added to the fiber surface, which effectively enhances the adhesion between the flat aramid filament bundle and TPU.

[0014] In the high-energy particle surface treatment process, the high-frequency high-voltage electrode plates are spaced 14-16mm apart, with a 1.5-2.5mm thick ceramic insulating plate inserted in between; power parameters: frequency 3000Hz, voltage 180V, generating low-temperature plasma particles; processing conditions: the distance between the filament bundle and the electrode plate is 7-9mm, and the processing speed is 15-25m / min.

[0015] In the co-extrusion-multi-stage cooling process, flat fiber bundles are impregnated with molten TPU through pultrusion, and aramid filament flat strips are gradually shaped through multi-stage cooling to achieve the set width requirements. The specific operation is as follows: the flattened aramid filament bundles are passed through an impregnation tank containing molten TPU, initially shaped by a flat mold, and then finally shaped through multi-stage cooling.

[0016] In the pultrusion-multi-stage cooling process, the TPU melt temperature is 190-200℃, the impregnation tank level is 40-60mm, the pultrusion speed is 15-25m / min, and the fiber impregnation rate is ≥95%. The inlet width = target strip width + 0.2mm, and the outlet width = target width (e.g., for a 6mm warp strip, the die outlet size is 6mm × 0.2mm). Multi-stage cooling can be achieved using multi-stage cooling roller sets to gradually reduce the temperature to 25℃. A specific 3-stage cooling gradient is 80℃ (stage 1) → 50℃ (stage 2) → 25℃ (stage 3), with each stage cooling time being 10s. After cooling, the strip's thermal shrinkage rate is ≤1%.

[0017] The high-strength, lightweight capsule material reinforcement of this invention is woven using a flat yarn circular loom. The reinforcement fabric has a 2 / 1 twill weave structure and a thickness of 0.5-2 mm; the areal density of the reinforcement is 150-400 g / m³. 2 The inner diameter ranges from 50 to 600 mm.

[0018] The airtight inner lining tube of the present invention has a double-layer structure, wherein the outer layer bonded to the reinforcement is a TPU layer, and the inner layer is a rubber material layer such as EPDM rubber, neoprene rubber, nitrile rubber, and silicone rubber. The outer layer thickness is 0.05-0.3mm, and the inner layer thickness is 0.1-0.5mm.

[0019] The airtight inner lining tubing of the present invention is prepared by a double-layer co-extrusion method. An aerogel thermal insulation layer is provided between the inner and outer layer dies of the co-extrusion equipment, which can reduce the impact of the difference in melting temperature between the inner and outer extruded materials.

[0020] During the composite processing of high-strength lightweight capsule material, a rubber tube is first inserted and covered inside the reinforcement. Saturated steam at 120℃-135℃ is introduced into the rubber tube lining of the airtight layer, and pressure is maintained for 2-5 minutes for thermal bonding. After cooling, pressure testing, drying, and winding, a high-strength lightweight capsule material product is formed.

[0021] The advantages of this invention are: To address the issues of large reinforcement thickness and low fiber strength utilization, high-strength para-aramid fibers are used as the reinforcement material. The thickness of the fiber bundle is reduced through flattening treatment, effectively reducing the thickness of the reinforcement of the same specification. After the fiber bundle is flattened, the fibers are straightened and parallel, effectively increasing the fiber strength utilization. To address the issue of poor adhesion between the airtight inner lining tube and the reinforcement, a co-extrusion-multi-stage cooling plasticizing process is adopted. Through co-extrusion, the flat fiber bundles are fully impregnated with molten TPU. The adhesion between the inner lining tube and the reinforcement is further improved by using a double-layer structure with TPU as the outer layer. To address the issue of excessively thick inner tubing in airtight layers, this invention utilizes flat strips of aramid filaments shaped by thermoplastic polyurethane as warp and weft bundles, reducing the protrusion height at the warp and weft interlacing points and obtaining a smooth surface of the reinforcing body. Therefore, using thinner inner tubing in airtight layers can achieve higher airtightness. High-energy particle surface treatment can be used to micro-etch the fiber surface in flat aramid bundles, while adding oxygen-containing groups to the fiber surface, effectively enhancing the adhesion between flat aramid bundles and TPU. Detailed Implementation

[0022] The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the descriptions in the embodiments are for illustrative purposes only and should not, and will not, limit the invention as detailed in the claims.

[0023] The airflow flattening treatment schemes in each embodiment are improvements on the existing airflow flattening equipment. The existing equipment mainly consists of an airflow nozzle, a fiber bundle channel, a rear roller, and a heating module. The improved scheme of this invention adds a set of stabilizing guide rollers before and after the airflow nozzle, with a guide roller spacing of 50-60mm, forming a constraint path of "front stabilizing guide roller - nozzle - rear stabilizing guide roller - rear roller", controlling the width of the airflow disturbance zone to 5-8mm, and the lateral offset of the fiber bundle before contact with the rear roller is ≤0.5mm.

[0024] The added stabilizing guide roller is a stainless steel stabilizing guide roller (30mm in diameter, surface finish Ra0.8), which reduces the width of the airflow disturbance zone from 10-15mm in traditional processes to 5-8mm. The airflow velocity during the airflow flattening process is 350-450m / s, and the heating temperature is 90-110℃. The flatness deviation of the filament bundle after treatment is ≤2%.

[0025] In each embodiment, during the high-energy particle surface treatment process, the high-frequency high-voltage electrode plates are spaced 15mm apart, with a 2mm thick ceramic insulating plate inserted in between; power parameters: frequency 3000Hz, voltage 180V, generating low-temperature plasma particles; processing conditions: the distance between the filament bundle and the electrode plate is 8mm, and the processing speed is 20m / min.

[0026] In each embodiment, during the pultrusion-multi-stage cooling process, the TPU melt temperature is 190-200℃, the impregnation tank level is 40-60mm, the pultrusion speed is 15-25m / min, and the fiber impregnation rate is ≥95%. The inlet width = target strip width + 0.2mm, and the outlet width = target width (e.g., for a 6mm warp strip, the die outlet size is 6mm × 0.2mm). Multi-stage cooling uses a 3-stage cooling roller assembly with a temperature gradient of 80℃ (stage 1) → 50℃ (stage 2) → 25℃ (stage 3), with each stage cooling for 10s. After cooling, the strip's thermal shrinkage rate is ≤1%.

[0027] In each embodiment, the airtight inner lining tubing is prepared using a double-layer co-extrusion method. An aerogel thermal insulation layer is provided between the inner and outer layer dies of the co-extrusion equipment to reduce the impact of the difference in melting temperature between the inner and outer extruded materials. During the double-layer co-extrusion process, a twin-screw composite extruder is selected (a 50mm diameter single-screw extruder can be used for the outer TPU layer, and a 45mm diameter single-screw extruder can be used for the inner rubber material), and concentric double-layer circular dies are configured, with a 2mm thick silica aerogel thermal insulation layer between the dies.

[0028] In the raw material pretreatment stage of double-layer co-extrusion, TPU granules are dried at 80-90℃ for 4 hours and then fed into the outer extruder, while the inner rubber compound is preheated at 80℃ and then added into the inner extruder.

[0029] In the co-extrusion process of the two-layer co-extrusion, the extrusion temperature of the outer layer TPU is controlled as follows: 180℃ in zone 1 of the barrel, 190℃ in zone 2, 200℃ in zone 3, and 200℃ at the die head, with a screw speed of 35-45 rpm. The extrusion temperature of the inner layer rubber is controlled as follows: 150℃ in zone 1 of the barrel, 160℃ in zone 2, 170℃ in zone 3, and 170℃ at the die head, with a screw speed of 25-35 rpm. The flow rate is precisely controlled by a melt metering pump. After extrusion through the die head, the outer layer flow channel width is 0.8mm and the outlet gap is 0.2mm, and the inner layer flow channel width is 1.0mm and the outlet gap is 0.3mm. The material then enters a three-stage cooling water tank (first stage 60-70℃, second stage 40-50℃, and third stage 25-30℃) for cooling and shaping. Finally, it is wound into a roll at a traction speed of 5-8m / min. The prepared airtight inner lining tube has an outer TPU layer thickness of 0.2mm, an inner EPDM rubber layer thickness of 0.3mm, a total thickness of 0.5mm, an outer diameter of 99.5±0.2mm, and an inner diameter of 99.0±0.2mm. It can be precisely matched with a 100mm diameter reinforcement to meet the expansion bonding requirements during thermal bonding.

[0030] The peel strength test method for the inner lining tube in each embodiment is as follows: a sample with a width of 25 mm and a length of 150 mm is cut from the bladder material, and a 180° peel structure is formed by pre-peeling 50 mm along the interface between the reinforcement and the inner lining tube. The test is performed using a universal testing machine at a tensile speed of 100 mm / min and a clamp spacing of 100 mm. The average value of the force in the stable section is recorded, and the result is expressed as "N / 25 mm". The test process complies with the requirements of GB / T 2790 "Test Method for 180° Peel Strength of Adhesives".

[0031] Example 1

[0032] This material adopts a structure with an outer layer as a reinforcement and an inner layer as an airtight lining rubber tube.

[0033] To ensure the safety of the capsule material, it is generally necessary to break the weft filaments when the capsule bursts. This usually requires high warp filament strength and density. In this embodiment, a higher warp filament density is used. To allow for the arrangement of the warp filaments, the width after flattening is 6mm. The weft filament density is relatively low, and the width after flattening is 8mm.

[0034] The reinforcement is a tubular fabric woven from warp and weft yarns. The warp yarns are made of 6000D para-aramid filaments, which undergo an improved airflow flattening process. Based on the existing airflow flattening process, a stabilizing guide roller is added to control the width of the airflow disturbance zone, reduce fiber disturbance before contact with the rear roller, and ensure the stability of the flattening process. High-energy particles are generated by inserting a ceramic insulating plate between high-frequency high-voltage electrode plates at a speed of 20 m / min after surface treatment. The ceramic plate is 2 mm thick, the power supply frequency is 3000 Hz, and the voltage is 180 V.

[0035] Finally, through pultrusion and multi-stage cooling, the flattened aramid filament bundles are passed through an impregnation tank containing molten TPU, pre-shaped by a flat mold, and then finally shaped by multi-stage cooling to produce TPU-shaped aramid filament flat strips with a width of 6 mm and a thickness of 0.3 mm.

[0036] The weft yarn is made of 6000D para-aramid filament and is processed using the same process as the warp yarn. The strip width is 8mm and the strip thickness is 0.3mm.

[0037] A 100mm diameter reinforcement was woven using a flat yarn circular loom. The fabric structure was a 2 / 1 twill, with 50 warp yarns and a weft yarn density of 12.3 yarns / 10cm. The reinforcement thickness was 1.2mm, and the areal density was 300g / m². 2 .

[0038] The airtight inner lining tube has a double-layer structure, with an outer layer of 0.2mm TPU and an inner layer of 0.3mm EPDM rubber. The airtight inner lining tube is prepared by double-layer co-extrusion, and an aerogel thermal insulation layer is provided between the inner and outer layer dies of the co-extrusion equipment.

[0039] A rubber tube is inserted and covered within the reinforcing body. Saturated steam at 135°C is introduced into the rubber tube lining of the airtight layer, and the pressure is maintained for 5 minutes for thermal bonding. After cooling, pressure testing, drying, and winding, a high-strength and lightweight capsule material product is formed.

[0040] Water is injected into the high-strength, lightweight capsule material using a pressure burst testing machine until the capsule material bursts. The water pressure at this point is the product burst pressure.

[0041] The burst pressure of the high-strength lightweight capsule material with a diameter of 100mm was tested to be 12.4MPa, the peel strength of the inner lining tube reached 72N / 25mm, and the linear density was 220g / m. In contrast, the burst pressure of the capsule material made with the same linear density and weaving parameters but without "high-energy particle surface treatment" and "impregnation TPU-pultrusion-multi-stage cooling" treatment was only 10.2MPa.

[0042] Example 2

[0043] This material adopts a structure with an outer layer as a reinforcement and an inner layer as an airtight lining rubber tube.

[0044] To ensure the safety of the capsule material, it is generally necessary to break the weft filaments when the capsule bursts. This usually requires high warp filament strength and density. In this embodiment, a higher warp filament density is used. To allow for the arrangement of the warp filaments, the width after flattening is 6mm. The weft filament density is relatively low, and the width after flattening is 8mm.

[0045] The warp bundle uses 4000D para-aramid filaments, which undergo an improved airflow flattening process. A stabilizing guide roller is added to the existing airflow flattening process to control the width of the airflow disturbance zone, reducing fiber disturbance before contact with the rear roller and ensuring the stability of the flattening process. The bundle is then subjected to high-energy particle surface treatment at a speed of 20 m / min. High-energy particles are generated by inserting a ceramic insulating plate between high-frequency, high-voltage electrode plates. The ceramic plate is 2 mm thick, the power supply frequency is 3000 Hz, and the voltage is 180 V. Finally, the flattened aramid filament bundle undergoes pultrusion-multi-stage cooling, passing through an impregnation tank containing molten TPU. It is initially shaped by a flattening mold and then undergoes multi-stage cooling to achieve final shaping, producing a TPU-shaped aramid filament flat strip with a width of 6 mm and a thickness of 0.3 mm.

[0046] The weft yarn is made of 4000D para-aramid filament and is processed using the same process as the warp yarn. The strip width is 8mm and the thickness is 0.3mm.

[0047] A 100mm diameter reinforcement is woven using a flat yarn circular loom. The fabric structure is 2 / 1 twill, with 50 warp yarns and a weft yarn density of 12.3 yarns / 10cm. The reinforcement thickness is 1.0mm.

[0048] The airtight inner lining tubing has a double-layer structure: an outer 0.15mm TPU layer and an inner 0.2mm EPDM rubber layer.

[0049] A rubber tube is inserted and covered within the reinforcing body. Saturated steam at 135°C is introduced into the rubber tube lining of the airtight layer, and the pressure is maintained for 5 minutes for thermal bonding. After cooling, pressure testing, drying, and winding, a high-strength and lightweight capsule material product is formed.

[0050] Water is injected into the high-strength, lightweight capsule material using a pressure burst testing machine until the capsule material bursts. The water pressure at this point is the product burst pressure.

[0051] The high-strength, lightweight capsule material with a 100mm diameter was tested and found to have a burst pressure of 9.1MPa, a peel strength of 71N / 25mm for the inner lining tubing, and a linear density of 145g / m.

[0052] Example 3

[0053] This material adopts a structure with an outer layer as a reinforcement and an inner layer as an airtight lining rubber tube.

[0054] The same steps as in Example 1 are used.

[0055] The warp bundle uses 4000D para-aramid filaments, which are processed by improved airflow flattening treatment (adding a stabilizing guide roller to control the width of the airflow disturbance zone to 5-8mm), high-energy particle surface treatment (3000Hz, 180V, ceramic plate thickness 2mm, speed 20m / min), and pultrusion-multi-stage cooling (molten TPU impregnation, flat die shaping) to produce a flat strip with a width of 6mm and a thickness of 0.15mm.

[0056] The weft strands are processed using the same technology to produce 4000D para-aramid filaments, which are then made into a strip with a width of 8mm and a thickness of 0.18mm.

[0057] A 100mm diameter reinforcement was woven using a flat yarn circular loom. The fabric structure was 2 / 1 twill, with 50 warp yarns and a weft density of 12.3 yarns / 10cm. The reinforcement thickness was 1.0mm.

[0058] The airtight inner lining tubing has a double-layer structure, consisting of an outer 0.15mm TPU layer and an inner 0.2mm nitrile rubber layer.

[0059] After inserting the rubber tube into the reinforcing body, it is heat-bonded by passing saturated steam at 135℃ for 5 minutes. After cooling, pressure testing, drying, and winding, the product is manufactured. Tests show that the burst pressure is 9.2MPa when the diameter is 100mm, the peel strength of the inner rubber tube is 75N / 25mm, the linear density is 145g / m, and the oil resistance of the nitrile rubber inner layer is better than that of EPDM rubber, making it suitable for oily environments. The performance is basically the same as that of the original embodiment.

[0060] Comparative Example 1

[0061] This embodiment uses a higher warp yarn density, and the width after flattening is 6mm to allow for the arrangement of the warp yarns; the weft yarn density is relatively low, and the width after flattening is 8mm.

[0062] The warp bundle uses 6000D para-aramid filaments and undergoes an improved airflow flattening process. Based on the existing airflow flattening process, a stabilizing guide roller is added to control the width of the airflow disturbance zone, reduce fiber disturbance before contact with the rear roller, and ensure the stability of the flattening process. Finally, after pultrusion and multi-stage cooling, the flattened aramid filament bundle is passed through an impregnation tank containing molten TPU, initially shaped by a flattening mold, and then finally shaped by multi-stage cooling to produce a TPU-shaped aramid filament flat strip with a width of 6 mm and a thickness of 0.3 mm.

[0063] The weft yarn is made of 6000D para-aramid filament and is processed using the same process as the warp yarn. The strip width is 8mm and the strip thickness is 0.3mm.

[0064] A 100mm diameter reinforcement was woven using a flat yarn circular loom. The fabric structure was a 2 / 1 twill, with 50 warp yarns and a weft yarn density of 12.3 yarns / 10cm. The reinforcement thickness was 1.2mm, and the areal density was 300g / m². 2 .

[0065] The airtight inner lining tubing has a double-layer structure, with an outer layer of 0.2mm TPU and an inner layer of 0.3mm EPDM rubber. A rubber tube is inserted and covered within the reinforcing body. Saturated steam at 135°C is introduced into the rubber tube lining of the airtight layer, and the pressure is maintained for 5 minutes for thermal bonding. After cooling, pressure testing, drying, and winding, the capsule material product is formed.

[0066] Water is injected into the bladder material using a pressure burst testing machine until the bladder material bursts. At this point, the water pressure is the product burst pressure.

[0067] The product with a diameter of 100mm was tested and found to have a burst pressure of 12.3MPa, a peel strength of 56N / 25mm for the inner lining tubing, and a linear density of 220g / m. In contrast, the burst pressure of the capsule material made with the same linear density of warp and weft yarns and the same weaving parameters but without flattening treatment was only 10.1MPa.

[0068] Comparative Example 2

[0069] It also adopts a structure with an outer layer as a reinforcement and an inner layer as an airtight lining rubber tube.

[0070] The warp yarns are made of 6000D para-aramid filaments; the weft yarns are made of 6000D para-aramid filaments.

[0071] A 100mm diameter reinforcement was woven on a circular loom. The fabric structure was a 2 / 1 twill, with 50 warp yarns and a weft yarn density of 12.3 yarns / 10cm. The reinforcement thickness was 5mm, and the areal density was 300g / m².2 .

[0072] The airtight inner lining tubing has a double-layer structure, with an outer layer of 0.5mm TPU and an inner layer of 0.5mm EPDM rubber. A rubber tube is inserted and covered within the reinforcing body. Saturated steam at 135°C is introduced into the rubber tube lining of the airtight layer, and the pressure is maintained for 5 minutes for thermal bonding. After cooling, pressure testing, drying, and winding, the capsule material product is formed.

[0073] Water is injected into the bladder material using a pressure burst testing machine until the bladder material bursts. At this point, the water pressure is the product burst pressure.

[0074] The product with a diameter of 100mm was tested and found to have a burst pressure of 10.2Pa, a peel strength of 52N / 25mm for the inner lining tubing, and a linear density of 300g / m.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications may still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-strength, lightweight capsule material, characterized in that... It is a two-layer flexible hose, including a reinforcing body and an airtight inner lining; the reinforcing body is woven from flattened aramid filament strips as warp and weft bundles.

2. The high-strength, lightweight capsule material according to claim 1, characterized in that... The inner diameter of the hose is 50-600mm.

3. The high-strength, lightweight capsule material according to claim 1, characterized in that... The warp and weft yarns are made of para-aramid filaments with a specification of 1500D-9000D. After improved airflow flattening treatment, high-energy particle surface treatment, and finally co-extrusion-multi-stage cooling, thermoplastic polyurethane-shaped aramid filament flat strips are prepared. The width of the aramid filament flat strips is 2mm-10mm and the thickness is 0.2-0.5mm.

4. The high-strength, lightweight capsule material according to claim 3, characterized in that... The improved airflow flattening process involves adding a set of stabilizing guide rollers before and after the airflow nozzle during the airflow flattening process. The guide rollers are spaced 50-60mm apart, which controls the width of the airflow disturbance zone to 5-8mm and the lateral offset of the fiber bundle before contact with the rear roller is ≤0.5mm.

5. The high-strength, lightweight capsule material according to claim 3, characterized in that... In the high-energy particle surface treatment process, the high-frequency high-voltage electrode plates are spaced 14-16 mm apart, with a 1.5-2.5 mm thick ceramic insulating plate inserted in between; power parameters: frequency 3000 Hz, voltage 180 V, generating low-temperature plasma particles; processing conditions: the distance between the filament bundle and the electrode plates is 7-9 mm, and the processing speed is 15-25 m / min.

6. The high-strength, lightweight capsule material according to claim 3, characterized in that... The co-extrusion-multi-stage cooling process involves passing flattened aramid filaments through an impregnation tank containing molten TPU, initially shaping them through a flattened mold, and then finally shaping them through multi-stage cooling.

7. The high-strength, lightweight capsule material according to claim 6, characterized in that... During the pultrusion-multi-stage cooling process, the TPU melt temperature is 190-200℃, the impregnation tank liquid level is 40-60mm, the pultrusion speed is 15-25m / min, and the fiber impregnation rate is ≥95%.

8. The high-strength, lightweight capsule material according to claim 1, characterized in that... The weaving step employs a flat yarn circular loom, with the reinforcing fabric having a 2 / 1 twill weave and a thickness of 0.5-2 mm; the areal density of the reinforcing fabric is 150-400 g / m³. 2 The inner diameter ranges from 50 to 600 mm.

9. The high-strength, lightweight capsule material according to claim 1, characterized in that... The airtight inner lining tube has a double-layer structure, wherein the outer layer bonded to the reinforcement is a TPU layer, and the inner layer is a layer of EPDM rubber, neoprene rubber, nitrile rubber or silicone rubber material. The outer layer thickness of the inner lining tube is 0.05-0.3mm, and the inner layer thickness is 0.1-0.5mm.

10. The high-strength, lightweight capsule material according to claim 9, characterized in that... The airtight inner lining tube is prepared by double-layer co-extrusion, and an aerogel thermal insulation layer is provided between the inner and outer layer die heads of the co-extrusion equipment.