A drag reduction bladder material, its preparation method and application

Abstract

The present invention belongs to the field of bladder materials, and particularly relates to a drag reduction bladder material, a preparation method thereof, and an application thereof. The drag reduction bladder material provided by the present invention comprises a weather-resistant layer, a drag reduction load-bearing layer, and a barrier layer that are in contact with each other in sequence. The drag reduction load-bearing layer is a plain fabric after dipping and curing; the number of weft yarns of the plain fabric is 1, and the fineness of the weft yarn is 200-300 dtex; the warp yarns of the plain fabric comprise a first warp yarn and a second warp yarn, and the first warp yarn and the second warp yarn are arranged in a cross and cyclic manner in sequence; the number of the first warp yarns is 1, and the fineness is 200-500 dtex; the number of the second warp yarns is 1, and the fineness is 500-1000 dtex; or the number of the second warp yarns is 2-4, and the fineness is 200-300 dtex. The bladder material provided by the present invention utilizes the natural texture of the fiber fabric to construct a drag reduction microstructure, has a good drag reduction effect, and does not need to add or attach a drag reduction layer.

Description

Technical Field

[0001] The present invention belongs to the field of bladder materials, and particularly relates to a drag-reducing bladder material, a preparation method thereof, and an application thereof. Background Art

[0002] As an aircraft, the aerostat has been manufactured and used by humans for hundreds of years. It utilizes the fact that the density of helium is less than that of air to provide assistance to the aircraft, enabling the aircraft to lift off by static lift force and allowing the aircraft to fly at a fixed point for a long time. Relying on new bladder materials and advanced control systems and power systems, the aerostat has truly entered the practical fields of civil and military use. As the largest and most important part of the aerostat, the aerostat bladder material must meet high-performance requirements, and its quality directly determines the vitality of the airship. Its preparation technology is one of the key technologies restricting the development of airships.

[0003] Currently, the research on surface drag reduction technology at home and abroad mainly focuses on drag reduction on the surface of aircraft fuselages, drag reduction in natural gas transportation, long-distance transportation of liquids (water, oil), and drag reduction of underwater weapons and equipment (submarines, torpedoes, etc.). Although the existing surface drag reduction technologies have been successfully applied to the structures of aircraft and other flying vehicles, they are all drag reduction applications based on rigid substrates, and there are few drag reduction applications for flexible moving objects. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a drag-reducing bladder material, a preparation method thereof, and an application thereof. The bladder material provided by the present invention utilizes the natural texture of the fiber fabric to construct a drag-reducing micro-structure, has a good drag-reducing effect, and does not require adding or attaching a drag reduction layer.

[0005] The present invention provides a drag-reducing bladder material, including a weather-resistant layer, a drag-reducing load-bearing layer, and a barrier layer in contact in sequence. The drag-reducing load-bearing layer is a plain fabric after dipping and curing;

[0006] The number of warp yarns of the plain fabric is 1, and the fineness of the warp yarn is 200 - 300 dtex; the warp yarns of the plain fabric include a first warp yarn and a second warp yarn, and the first warp yarn and the second warp yarn are arranged in a cross and cyclic manner in sequence; the number of the first warp yarn is 1, and the fineness is 200 - 500 dtex; the number of the second warp yarn is 1, and the fineness is 500 - 1000 dtex; or, the number of the second warp yarn is 2 - 4, and the fineness is 200 - 300 dtex;

[0007] The surface of the drag-reducing bladder material presents a continuous concave-convex structure of fabric texture through the interwoven warp yarns and weft yarns of the plain fabric.

[0008] Preferably, the areal density of the plain fabric is 100 - 150 g / m 2 .

[0009] Preferably, the material of the plain weave fabric is one or more of nylon fiber, aramid fiber and polyarylate fiber.

[0010] Preferably, by mass percentage, the components of the weather-resistant layer include: 90-94% of polyurethane resin, 3-5% of nano-titanium dioxide, 1-2% of light stabilizer, 0.5-2% of carbon black, and 1-3% of mica flakes.

[0011] Preferably, the surface density of the weather-resistant layer is 70-100 g / m 2 .

[0012] Preferably, the material of the barrier layer is polyester; the surface density of the barrier layer is 10-20 g / m 2 .

[0013] The present invention provides a preparation method of the drag reduction bladder material described in the above technical solution, including the following steps:

[0014] a) Apply an adhesive on one side surface of the drag reduction load-bearing layer, and then press and dry the side with the applied adhesive with the barrier layer to obtain a double-layer composite layer;

[0015] b) Thermally press and composite the weather-resistant layer with the drag reduction load-bearing layer of the double-layer composite layer to obtain the drag reduction bladder material.

[0016] Preferably, the drag reduction load-bearing layer is prepared according to the following steps:

[0017] The plain weave fabric is subjected to dipping treatment, drying, and heat setting to obtain a dipped fabric;

[0018] The dipped fabric is subjected to dipping treatment again, drying, and heat recovery to obtain the drag reduction load-bearing layer.

[0019] Preferably, before applying the adhesive to the drag reduction load-bearing layer, the surface of the drag reduction load-bearing layer where the adhesive is to be pre-applied is subjected to plasma treatment.

[0020] The present invention provides a bladder, and the material of the bladder includes the drag reduction bladder material described in the above technical solution or the drag reduction bladder material prepared by the preparation method described in the above technical solution.

[0021] Compared with the prior art, the present invention provides a drag reduction bladder material, a preparation method and an application thereof. The drag reduction bladder material provided by the present invention comprises a weather resistance layer, a drag reduction load-bearing layer and a barrier layer which are in contact with each other in sequence, wherein the drag reduction load-bearing layer is a plain fabric after dipping and curing; the number of weft yarn strands of the plain fabric is 1, and the fineness of the weft yarn is 200-300 dtex; the warp yarns of the plain fabric comprise a first warp yarn and a second warp yarn, and the first warp yarn and the second warp yarn are arranged in a cross and cyclic manner in sequence; the number of strands of the first warp yarn is 1, and the fineness is 200-500 dtex; the number of strands of the second warp yarn is 1, and the fineness is 500-1000 dtex; or, the number of strands of the second warp yarn is 2-4, and the fineness is 200-300 dtex; the plain fabric enables the surface of the drag reduction bladder material to present a fabric texture with a continuous concave-convex structure through the interwoven warp yarns and weft yarns. The present invention uses a cured fabric as the load-bearing layer of the bladder material, and by optimizing the selection of the weaving method and the warp and weft yarn specifications of the fabric, a continuous ridge and groove structure with specific specifications is formed on the fabric surface, and the texture of these continuous ridge and groove structures can still be presented on the surface of the bladder material, thereby endowing the bladder material with drag reduction performance. The bladder material provided by the present invention has excellent drag reduction performance, mechanical strength and weather resistance and barrier performance, and has good application prospects in the fields of aerostat bladder and underwater flexible oil storage bladder materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the cross section in the weft direction of the fabric provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] The present invention provides a drag reduction bladder material, which comprises a weather resistance layer, a drag reduction load-bearing layer and a barrier layer which are in contact with each other in sequence.

[0026] In the bladder material provided by the present invention, the composition of the weather-resistant layer includes: polyurethane resin, nano-titanium dioxide, light stabilizer, carbon black, and mica flakes; wherein, the number-average molecular weight of the polyurethane resin is preferably 50,000 to 150,000, more preferably 80,000 to 100,000; the particle size of the nano-titanium dioxide is preferably 1 to 50 nm, more preferably 20 to 30 nm; the light stabilizer is preferably a hindered amine light stabilizer, more preferably light stabilizer 791; the particle size of the mica flakes is preferably 500 to 1000 mesh, more preferably 700 to 800 mesh; the mass content of the polyurethane resin in the weather-resistant layer is preferably 90 to 94%, specifically 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%, or 94%; the mass content of the nano-titanium dioxide in the weather-resistant layer is preferably 3 to 5%, specifically 3%, 3.5%, 4%, 4.5%, or 5%; the mass content of the light stabilizer in the weather-resistant layer is preferably 1 to 2%, specifically 1%, 1.5%, or 2%; the mass content of the carbon black in the weather-resistant layer is preferably 0.5 to 2%, specifically 0.5%, 1%, 1.5%, or 2%; the mass content of the mica flakes in the weather-resistant layer is preferably 1 to 3%, specifically 1%, 1.5%, 2%, 2.5%, or 3%.

[0027] In the bladder material provided by the present invention, the surface density of the weather-resistant layer is preferably 70 to 100 g / m 2 , specifically 70 g / m 2 , 72 g / m 2 , 75 g / m 2 , 77 g / m 2 , 80 g / m 2 , 85 g / m 2 , 88 g / m 2 , 90 g / m 2 , 92 g / m 2 , 95 g / m 2 or 100 g / m 2 .

[0028] In the bladder material provided by the present invention, the drag reduction and load-bearing layer is a plain fabric after dipping and curing; wherein, the number of weft yarns of the plain fabric is 1, and the fineness of the weft yarn is 200-300 dtex, more specifically 220 dtex; the warp yarns of the plain fabric include a first warp yarn and a second warp yarn, and the first warp yarn and the second warp yarn are arranged in a cross and cyclic manner in sequence; the number of the first warp yarns is 1, and the fineness is 200-500 dtex, more specifically 220 dtex or 440 dtex; the number of the second warp yarns is 1, and the fineness is 500-1000 dtex, more specifically 660 dtex or 880 dtex; or, the number of the second warp yarns is 2-4, more specifically 2, 3 or 4, and the fineness is 200-300 dtex, more specifically 220 dtex.

[0029] In the bladder material provided by the present invention, the material of the plain fabric in the drag reduction and load-bearing layer is preferably one or more of nylon fiber, aramid fiber and polyarylate fiber.

[0030] In the bladder material provided by the present invention, the surface density of the plain fabric in the drag reduction and load-bearing layer is preferably 100-150 g / m 2 , specifically it can be 100 g / m 2 , 105 g / m 2 , 110 g / m 2 , 115 g / m 2 , 120 g / m 2 , 125 g / m 2 , 130 g / m 2 , 135 g / m 2 , 140 g / m 2 , 145 g / m 2 or 150 g / m 2 .

[0031] In the bladder material provided by the present invention, the plain fabric in the drag reduction and load-bearing layer has undergone dipping and curing treatment, and the number of times of dipping and curing treatment is preferably 1-5 times, more preferably 2 times. In the specific embodiment provided by the present invention, the adhesive solution used for the first dipping and curing treatment is preferably an acrylate adhesive solution, and the dipping amount (dry adhesive amount) is preferably 15-20 g / m 2 , specifically it can be 15 g / m 2 , 16 g / m 2 , 17 g / m 2 , 18 g / m 2 , 19 g / m 2 or 20 g / m 2 ; the adhesive solution used for the second dipping and curing treatment is preferably an epoxy resin adhesive solution, and the dipping amount (dry adhesive amount) is preferably 10-15 g / m 2 , specifically it can be 10 g / m2 、 11 g / m 2 、 12 g / m 2 、 13 g / m 2 、 14 g / m 2 or 15 g / m 2 。

[0032] In the bladder material provided by the present invention, the warp and weft yarns interwoven in the drag reduction and load-bearing layer can make the surface of the bladder material present a fabric texture with a continuous concave-convex structure, thereby endowing the bladder material with drag reduction performance.

[0033] In the bladder material provided by the present invention, the material of the barrier layer is preferably polyester.

[0034] In the bladder material provided by the present invention, the areal density of the barrier layer is preferably 10-20 g / m 2 , specifically it can be 10 g / m 2 、 11 g / m 2 、 12 g / m 2 、 13 g / m 2 、 14 g / m 2 、 15 g / m 2 、 16 g / m 2 、 17 g / m 2 、 18 g / m 2 、 19 g / m 2 or 20 g / m 2 。

[0035] In the bladder material provided by the present invention, the thickness of the barrier layer is 50-100 μm, specifically it can be 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm.

[0036] In the bladder material provided by the present invention, the weather-resistant layer and the drag reduction and load-bearing layer are preferably thermocompression bonded, and the drag reduction and load-bearing layer and the barrier layer are preferably glued.

[0037] In the bladder material provided by the present invention, the surface of the drag reduction and load-bearing layer on the side in contact with the barrier layer is preferably subjected to plasma treatment.

[0038] In the bladder material provided by the present invention, the overall areal density of the bladder material is preferably 200-250 g / m 2 , specifically it can be 200 g / m 2 、 205 g / m 2 、 210 g / m 2 、 215 g / m 2 、 220 g / m 2 、 225 g / m2 、 230 g / m 2 、 235 g / m 2 、 240 g / m 2 、 245 g / m 2 or 250 g / m 2 。

[0039] The present invention also provides a method for preparing the drag reduction bladder material described in the above technical solution, including the following steps:

[0040] a) Apply an adhesive on one side surface of the drag reduction load-bearing layer, and then press and dry the side with the applied adhesive against the barrier layer to obtain a double-layer composite layer;

[0041] b) Thermally press and composite the weather-resistant layer with the drag reduction load-bearing layer of the double-layer composite layer to obtain the drag reduction bladder material.

[0042] In the preparation method provided by the present invention, in step a), the drag reduction load-bearing layer is preferably prepared according to the following steps:

[0043] i) Immerse the plain weave fabric in glue, dry it, and thermally fix it to obtain an impregnated fabric;

[0044] ii) Immerse the impregnated fabric in glue again, dry it, and thermally recover it to obtain the drag reduction load-bearing layer.

[0045] In the above preparation steps of the drag reduction load-bearing layer provided by the present invention, in step i), the glue solution (also called sizing agent) used for the impregnation treatment is preferably an acrylate glue solution; the impregnation amount (dry glue amount) of the impregnation treatment is preferably 15-20 g / m 2 , specifically, it can be 15 g / m 2 , 16 g / m 2 , 17 g / m 2 , 18 g / m 2 , 19 g / m 2 or 20 g / m 2 ; the drying temperature is preferably 100-120 °C, specifically, it can be 100 °C, 105 °C, 110 °C, 115 °C or 120 °C; the drying time is preferably 1-3 h, specifically, it can be 3 h, 2.5 h, 2 h, 1.5 h or 1 h; the thermal fixing temperature is preferably 180-200 °C, specifically, it can be 180 °C, 185 °C, 190 °C, 195 °C or 200 °C; the tension stretching rate of the thermal fixing is preferably 95-99%, specifically, it can be 95%, 96%, 97%, 98% or 99%; the thermal fixing time is preferably 25-50 s, specifically, it can be 50 s, 45 s, 38 s, 35 s or 25 s.

[0046] In the above preparation steps of the drag reduction load-bearing layer provided by the present invention, in step ii), the adhesive solution used for the dipping treatment is preferably an epoxy resin adhesive solution; the dipping amount (dry adhesive amount) of the dipping treatment is preferably 10-15 g / m 2 , specifically it can be 10 g / m 2 , 11 g / m 2 , 12 g / m 2 , 13 g / m 2 , 14 g / m 2 or 15 g / m 2 ; the drying temperature is preferably 140-160 °C, specifically it can be 140 °C, 145 °C, 150 °C, 155 °C or 160 °C; the drying time is preferably 1-1.5 h, specifically it can be 1.5 h, 1.2 h or 1 h; the heat recovery temperature is preferably 120-130 °C, specifically it can be 120 °C, 125 °C or 130 °C; the heat recovery tension draw ratio is preferably 95-99%, specifically it can be 95%, 96%, 97%, 98% or 99%; the heat recovery time is preferably 15-40 s, specifically it can be 40 s, 35 s, 30 s, 25 s or 15 s.

[0047] In the above preparation steps of the drag reduction load-bearing layer provided by the present invention, the dipping treatment of the plain weave fabric is to improve the wear resistance, bundling property and weaving property of the fibers, and at the same time enhance the adhesion between the fibers and the adhesive, and improve the interfacial bonding ability between the load-bearing layer fabric and other functional layers.

[0048] In the preparation method provided by the present invention, in step a), before applying the adhesive to the drag reduction load-bearing layer, it is preferably to perform plasma treatment on the surface where the adhesive is pre-applied first. Among them, the discharge power of the plasma treatment is preferably 1.2-2.5 kW, specifically it can be 1.2 kW, 1.5 kW, 1.7 kW, 2 kW, 2.3 kW or 2.5 kW; the plasma treatment time is preferably 0.1-1 s, specifically it can be 0.1 s, 0.2 s, 0.3 s, 0.4 s, 0.5 s, 0.6 s, 0.7 s, 0.8 s, 0.9 s or 1 s. In the present invention, through the action of high-energy particles in the plasma, polar groups can be introduced on the surface of the fiber fabric, improving the wetting ability of the fiber fabric, and improving the interfacial bonding strength for subsequent compounding with the adhesive or other functional layer fibers.

[0049] In the preparation method provided by the present invention, in step a), the adhesive is preferably a polyurethane-based adhesive; the coating amount of the adhesive is preferably 5-10 g / m 2 , specifically it can be 5 g / m 2 , 6 g / m 2 , 7 g / m 2 , 8 g / m 2, 9 g / m 2 or 10 g / m 2 .

[0050] In the preparation method provided by the present invention, in step a), the pressure of the pressing and drying is preferably 0.5 - 1 MPa, and specifically can be 0.5 MPa, 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3 MPa, 3.5 MPa, 4 MPa, 4.5 MPa or 5 MPa; the temperature of the pressing and drying is preferably 60 - 80 °C, and specifically can be 60 °C, 65 °C, 70 °C, 75 °C or 80 °C; the time of the pressing and drying is preferably 2 - 5 h, and specifically can be 2 h, 2.5 h, 3 h, 3.5 h, 4 h, 4.5 h or 5 h.

[0051] In the preparation method provided by the present invention, in step b), the temperature of the hot pressing and compounding is preferably 120 - 160 °C, and specifically can be 120 °C, 125 °C, 130 °C, 135 °C, 140 °C, 145 °C, 150 °C, 155 °C or 160 °C; the pressure of the hot pressing and compounding is preferably 0.5 - 1.5 MPa, and specifically can be 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa or 1.5 MPa; the time of the hot pressing and compounding is preferably 2 - 4 s, and specifically can be 2 s, 2.5 s, 3 s, 3.5 s or 4 s.

[0052] The present invention also provides a bladder, and the material of the bladder includes the drag reduction bladder material described in the above technical solution or the drag reduction bladder material prepared by the preparation method described in the above technical solution.

[0053] In the bladder provided by the present invention, the barrier layer of the drag reduction bladder material is the inner layer, and the weather resistance layer is the outer layer.

[0054] The technical solution provided by the present invention uses a cured fabric as the load-bearing layer of the bladder material. By optimizing the selection of the weaving method and the warp and weft yarn specifications of the fabric, a continuous ridge and groove structure with specific specifications is formed on the surface of the fabric, and the texture of these continuous ridge and groove structures can still be presented on the surface of the bladder material, thereby endowing the bladder material with drag reduction performance. The bladder material provided by the present invention has excellent drag reduction performance, mechanical strength and weather resistance barrier performance, and has good application prospects in the fields of aerostat bladder and underwater flexible oil storage bladder materials.

[0055] For the sake of clarity, the following is a detailed description through the following examples.

[0056] Example 1

[0057] Screening of the formulation of the weather resistance layer composition:

[0058] Add polyurethane resin, nano-titanium dioxide, light stabilizer, carbon black and mica flakes into a kneader according to the ratio in Table 1. The kneading temperature is 130 °C, the kneading time is 8 minutes, and the rotor speed is 100 revolutions per minute. The kneaded polyurethane material obtained is cut into pieces while it is hot, and then through a hot pressing process, the hot pressing temperature is 120 °C, and the pressure is 1.2 MPa to obtain a weather-resistant layer of polyurethane film; the areal density of this weather-resistant layer is 70 - 100 g / m 2 。

[0059] Table 1 Composition formula table of the weather-resistant layer (unit: parts by mass)

[0060]

[0061] Test the solar reflectance and transmittance of the weather-resistant layer material of the above formula to evaluate the weather resistance effect of the material, and at the same time detect its gas permeability. The results are shown in Table 2:

[0062] Table 2 Performance comparison table of weather-resistant layers with different components

[0063]

[0064] According to the test of the performance of the weather-resistant layer material, preferably select Formula 2 with excellent comprehensive performance as the weather-resistant layer material for subsequent examples.

[0065] Example 2

[0066] Prepare drag reduction bladder materials of different specifications. The specific process is as follows:

[0067] (1) Prepare fabrics of different specifications:

[0068] The fabrics used in this example are all woven into plain fabrics with polyarylate fibers, and the areal density is 110 - 125 g / m 2 ; The cross-sectional structure in the weft direction of the plain fabric is as Figure 1 shown, Figure 1 in which, the x-axis direction is the weft yarn direction, with continuous weft fibers; the y-axis direction is the warp yarn direction, and the elliptical cross-section is the warp fiber; there are no continuous fibers in the z-axis direction, that is, the fabric only has the height in the warp and weft directions. As Figure 1 shown, by adjusting the number of strands and arrangement of the warp fibers, different specifications of "ridge and groove" structures can be constructed on the fabric surface. Among them, h + is the highest height of the fabric, that is, the height of the ridge and groove; s + is the spacing between two highest heights, that is, the interval of the ridge and groove; d is the width of the ridge and groove.

[0069] In this embodiment, the fineness of the weft yarns of fabrics with different specifications remains consistent, all being 220 dtex, and the number of strands is 1; for the number of strands and arrangement pattern of the warp yarns of the fabric, as well as the ridge and furrow dimensions of fabrics with different specifications, refer to Table 3:

[0070] Table 3 Information Table of Fabrics with Different Specifications

[0071]

[0072] (2) Preparation of the drag reduction and load-bearing layer:

[0073] The above-mentioned fabric materials with different specifications are subjected to the first dipping treatment, and then the first drying and heat setting are carried out to obtain a one-bath dipped fabric; among them, the sizing agent used in the first dipping treatment is acrylate sizing solution, and the dipping amount (dry) is 15 g / m 2 , the temperature of the first drying is 110 °C, the time is 2 h, the temperature of the heat setting is 195 °C, the tension draw ratio is 98%, and the time is 35 s;

[0074] The one-bath dipped fabric is subjected to the second dipping treatment, and then drying and heat recovery are carried out to obtain the drag reduction and load-bearing layer material. Among them, the sizing agent used in the second dipping treatment is epoxy resin sizing solution, and the dipping amount (dry) is 10 g / m 2 , the temperature of the second drying is 150 °C, the time is 1.2 h, the temperature of the heat recovery is 120 °C, the tension draw ratio is 98%, and the time is 25 s.

[0075] (3) Lamination of the drag reduction and load-bearing layer and the barrier layer:

[0076] One side surface of the drag reduction and load-bearing layer material prepared in the above steps is subjected to plasma treatment, the plasma discharge power is 2.0 kW, and the time is 0.5 s; with the surface layer after plasma treatment facing up, 7 g / m of polyurethane adhesive is brushed 2 , and then the barrier layer material (polyester film, thickness is 75 μm, surface density is 15 g / m 2 ) is laminated, a pressure of 1.0 MPa is applied, and it is dried in a blast drying oven at 80 °C for 4 h to obtain a double-layer composite structure of the drag reduction and load-bearing layer and the barrier layer.

[0077] (4) Lamination of the drag reduction and load-bearing layer and the weather-resistant layer:

[0078] The weather-resistant layer material of Formulation 2 in Example 1 and the drag reduction and load-bearing layer of the above double-layer composite structure are hot-pressed and laminated by using a laminating composite device, the hot-pressing temperature is 150 °C, the hot-pressing pressure is 1.2 MPa, and the hot-pressing time is 3.5 s to obtain the drag reduction capsule material.

[0079] The drag reduction rate, areal density, tensile strength, interlayer peel strength, and gas permeability of the drag reduction bladder materials made of fabrics with different specifications are tested; among them, the test description of the drag reduction rate is as follows:

[0080] The drag reduction performance of the material is tested in a small DC wind tunnel; the length of the wind tunnel is 4 m and the diameter is 0.8 m; the wind speed is continuously adjustable in the range of 0 - 30.0 m / s; the range of the drag balance for testing is 300 N and the load resolution is 0.1; the calculation of the drag reduction rate is obtained by comparing with the wind resistance value of a smooth polyurethane bladder material; the drag reduction rate is equal to (the wind resistance shear force of the smooth TPU material minus the wind resistance shear force of the material of the embodiment) divided by the wind resistance shear force of the smooth TPU material multiplied by 100%; if the result is negative, it indicates that the material has a resistance increasing effect; if the result is 1, it indicates that the material neither increases nor reduces resistance; if the result is greater than 1, it indicates that the material has a drag reduction effect.

[0081] The test results are shown in Table 4:

[0082] Table 4 Performance test results of drag reduction bladder materials with different specifications

[0083]

[0084] It can be seen from Table 4 that when the height of the micro - structure "ridge - groove" is in the range of 30 - 90 μm, the interval is in the range of 70 - 155 μm, and the width is in the range of 20 - 73 μm, the bladder material has a drag reduction rate of 1.3 - 6.2%. The areal density of the bladder material prepared in this embodiment is 200 - 250 g / m 2 , the tensile strength is 834 - 946 N / cm, the interlayer peel strength is 3.2 - 5.4 kN / m; the gas permeability is 1.29 - 1.67 L / m 2 ·24h.

[0085] The above - mentioned are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A drag reduction capsule material, characterized in that: It comprises a weather-resistant layer, a drag-reducing bearing layer and a barrier layer which are in contact with each other in sequence, wherein the drag-reducing bearing layer is a plain woven fabric which has been impregnated and cured; The number of weft yarns of the plain fabric is 1, and the fineness of the weft yarns is 200-300 dtex; the warp yarns of the plain fabric include a first warp yarn and a second warp yarn, and the first warp yarn and the second warp yarn are arranged in a cross-circular manner; the number of plies of the first warp yarn is 1, and the fineness is 200-500 dtex; the number of plies of the second warp yarn is 1, and the fineness is 500-1000 dtex; or, the number of plies of the second warp yarn is 2-4, and the fineness is 200-300 dtex; The plain weave fabric makes the surface of the drag reduction bladder material present a fabric texture with a continuous concave-convex structure by interweaving warp yarns and weft yarns; The surface density of the plain fabric is 100-150 g / m 2 .

2. The drag reduction bladder material according to claim 1, characterized in that: The material of the plain fabric is one or more of nylon fiber, aramid fiber and polyarylate fiber.

3. The drag reduction bladder material according to claim 1, characterized in that: Calculated by mass percentage, the weather-resistant layer comprises: 90-94% polyurethane resin, 3-5% nano titanium dioxide, 1-2% light stabilizer, 0.5-2% carbon black, and 1-3% mica flakes.

4. The drag reduction bladder material according to claim 1, characterized in that: The surface density of the weather-resistant layer is 70 to 100 g / m 2 .

5. The drag reduction bladder material according to claim 1, characterized in that: The material of the barrier layer is polyester; the surface density of the barrier layer is 10-20 g / m 2 .

6. A method for preparing the drag reduction bladder material according to any one of claims 1 to 5, characterized in that: The following steps are involved: a) applying adhesive on one side of the drag-reducing bearing layer, and then pressing and drying the side coated with adhesive with the barrier layer to obtain a double-layer composite layer; b) hot-pressing the weather-resistant layer and the drag-reducing bearing layer of the double-layer composite layer to obtain a drag-reducing bladder material.

7. The preparation method according to claim 6, characterized in that: The drag reduction bearing layer is prepared according to the following steps: The plain fabric is subjected to a rubber dipping treatment, dried, and heat-fixed to obtain a rubber-dipping fabric; The dipped fabric is dipped again, dried, and thermally recovered to obtain a drag-reducing load-bearing layer.

8. The preparation method according to claim 6, characterized in that: Before the adhesive is applied to the drag-reducing bearing layer, the surface of the layer pre-applied with the adhesive is firstly subjected to plasma treatment.

9. A capsule, characterized in that: The material of the capsule includes the drag-reducing capsule material according to any one of claims 1 to 5 or the drag-reducing capsule material prepared by the preparation method according to any one of claims 6 to 8.

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