Long-fiber-reinforced high-pressure aeration hose and method for fabricating same

Abstract

The present invention relates to the field of high-pressure aeration hose technology, and specifically, to a long-fiber-reinforced high-pressure aeration hose and a method for fabricating same. The long-fiber-reinforced high-pressure aeration hose comprises a long-fiber braided outer reinforcement layer and a modified TPEE inner lining layer. The modified TPEE inner lining layer and the long-fiber braided outer reinforcement layer partially overlap and permeate each other in the thickness of a radial cross-section, and the modified TPEE inner lining layer has regularly distributed aeration micropores, wherein the thickness of the overlapping and permeation portion accounts for 50%-60% of the thickness of the modified TPEE inner lining layer. According to the present invention, the composite long-fiber braided structure is used as a reinforcement layer, such that the strength and the pressure-bearing capacity of the aeration hose are greatly improved. Without changing the size of the micropores, the aeration efficiency can be improved by increasing the pressure. The hose can also be repeatedly wound, recycled, and reused, and is less prone to deformation. The present invention adopts a one-time molding co-extrusion permeation and inversion process, such that the aeration hose can be extruded and applied over a long distance, and the strength and comprehensive performance of the hose body are excellent.

Description

A long fiber reinforced high-pressure aeration hose and its manufacturing method Technical Field

[0001] This invention relates to the field of high-pressure aeration hose technology, specifically to a long fiber reinforced high-pressure aeration hose and its manufacturing method. Background Technology

[0002] Aeration hoses are widely used in the biochemical treatment of industrial wastewater and municipal sewage in industries such as petrochemicals, textiles, food processing, papermaking, printing and dyeing, brewing, pharmaceuticals, and leather tanning. When existing aerators are inefficient or frequently clogged, aeration hoses can be used to upgrade them, improving oxygenation capacity and mixing effects. They are also used for aeration in recirculating aquaculture systems, high-density aquaculture systems, and ordinary fish ponds. Furthermore, they are used in wastewater equalization tanks to prevent the deposition of large particles of silt and can remove some organic matter.

[0003] Traditional aeration hoses are made of a single layer of TPU polyurethane material (existing technologies such as CN103663749B and CN201914968U). This single-layer material has low pressure resistance and low aeration efficiency. After repeated winding, the TPU elongation gradually increases, causing the aeration holes to enlarge and leading to aeration failure. Furthermore, because TPU has poor resistance to hydrolysis and acids / alkalis, it ages quickly due to hydrolysis after prolonged immersion in the aeration tank, reducing its lifespan. When the holes become covered by microorganisms and scale after long-term use, high-pressure cleaning is typically used, which enlarges the holes and also causes aeration failure. Additionally, traditional aeration hoses are typically 20-100 meters long. Due to the limited strength of single-layer polyurethane, they cannot be used over long distances and are prone to stretching damage and breakage during long-distance applications. Summary of the Invention

[0004] To address the technical problems of existing traditional aeration hoses, such as easy deformation, low pressure resistance, low strength, low aeration efficiency, low environmental stability, and low reliability in long-distance use, this invention provides a long-fiber reinforced high-pressure aeration hose and its manufacturing method. The hose manufactured by this invention has enhanced pressure resistance and significantly improved axial and radial strength. Without changing the orifice size, increasing pressure can improve aeration efficiency. Furthermore, it is not susceptible to breakage during long-distance installation and can be used for extended periods in chemically corrosive media, exhibiting good environmental stability.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A long fiber reinforced high-pressure aeration hose includes a long fiber braided outer reinforcing layer and a modified TPEE inner liner layer. The modified TPEE inner liner layer and the long fiber braided outer reinforcing layer overlap and permeate each other in the thickness portion of the radial cross section. The modified TPEE inner liner layer has regularly distributed aeration micropores.

[0007] The thickness of the overlapping penetration is in the range of 50%-60% of the thickness of the modified TPEE liner. The greater the thickness of the overlapping penetration, the higher the interlayer peel strength. However, the more overlapping penetration, the thinner the remaining tube (i.e., the liner) will be, which will reduce the tensile strength accordingly. Therefore, the thickness of the overlapping penetration is preferably in the range of 50%-60%.

[0008] Furthermore, the material of the modified TPEE inner liner is a modified TPEE material, which includes the following main materials in parts by weight: 30-50 parts of thermoplastic polyester elastomer (TPEE), 15-25 parts of chlorinated polyethylene, and 10-20 parts of acrylonitrile-butadiene-styrene terpolymer (ABS).

[0009] Furthermore, the modified TPEE material also includes the following auxiliary materials in parts by weight: 2-4 parts hydrolysis stabilizer, 2-5 parts antioxidant, 4-6 parts friction reducer, 0.5-1 part weathering agent, and 0.2-0.5 parts heat stabilizer.

[0010] Preferably, the hydrolytic stabilizer is polymeric carbodiimide (model KSJ-936); the antioxidant is antioxidant 1010 (i.e., pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]); the friction reducer is selected from one or more of molybdenum disulfide and graphite, with a particle size of less than 0.5 mm; the weathering agent is light stabilizer 119; and the heat stabilizer is BASF Irganox 245.

[0011] Furthermore, the long fiber woven outer reinforcing layer is made by weaving long fibers into a tubular strip from warp and weft according to design requirements (such as diameter, pressure, etc.), and the long fibers are selected from one or more of polyester fibers, aramid fibers, and continuous carbon fibers.

[0012] Furthermore, the thickness of the modified TPEE liner is in the range of 0.7mm-2mm.

[0013] Furthermore, 1,500 to 3,000 aeration micropores are distributed per meter on the long fiber reinforced high-pressure aeration hose; the diameter of the aeration micropores is 0.2 mm to 0.25 mm, and the depth of the aeration micropores is the thickness of the modified TPEE liner.

[0014] A method for manufacturing a long fiber reinforced high-pressure aeration hose includes the following steps:

[0015] S1. Long fibers are woven into tubular strip blanks from warp and weft according to design requirements, ready for use;

[0016] S2. The strip blank is threaded onto the core of the co-extrusion die, and the dried modified TPEE material is simultaneously drawn into the extruder. The extruder causes the modified TPEE material to form a melt extrusion, and the melt permeates from the outer surface of the strip blank through the front die of the co-extrusion die. That is, the two permeate in overlapping thickness of the radial section. After one-time co-extrusion permeation extrusion, under the action of traction, it is cooled, the surface is laser-drilled, and then wound up to obtain a pre-made hose.

[0017] S3. The prefabricated hose is flipped over using a tape-turning device to form a long fiber reinforced high-pressure aeration hose. Its structure is as follows: the modified TPEE material is used as the inner lining layer, the strip blank is used as the outer reinforcing layer, and aeration micropores are regularly distributed on the modified TPEE inner lining layer. The modified TPEE inner lining layer and the long fiber braided outer reinforcing layer overlap and permeate each other.

[0018] Furthermore, the modified TPEE material is processed using the following steps:

[0019] S21: Dry the thermoplastic polyester elastomer, chlorinated polyethylene, and acrylonitrile-butadiene-styrene terpolymer separately, and premix the chlorinated polyethylene and the acrylonitrile-butadiene-styrene terpolymer to obtain mixture A;

[0020] Simultaneously, hydrolysis stabilizer, friction reducer, antioxidant, and heat stabilizer are premixed to obtain mixture B;

[0021] S22: The thermoplastic polyester elastomer is heated and mixed with the mixture B, and then a weather-resistant agent is added and mixed to obtain mixture C;

[0022] S23: The mixture C is melt-blended, and the mixture A is added from the side feed port. The mixture is then extruded and granulated to obtain the modified TPEE material.

[0023] Preferably, the heating and mixing temperature is 35℃-45℃; the mixing rate of the entire steps S21 and S22 is 300rpm-600rpm, and the mixing time is at least 10min;

[0024] The melt blending described in S23 is carried out in a twin-screw extruder, and the temperature settings of the twin-screw extruder are as follows: Zone 1: 160°C, Zone 2: 170°C, Zone 3: 175°C, Zone 4: 180°C, Zone 5: 185°C, Zone 6: 190°C, Zone 7: 195°C, Zone 8: 200°C, Zone 9: 205°C, and Die Head: 210°C.

[0025] Furthermore, the extrusion temperature of the modified TPEE material to form a melt in the extruder described in S2 is 200℃-210℃.

[0026] Furthermore, the extrusion speed is consistent with the traction speed.

[0027] Beneficial technical effects:

[0028] This invention relates to a long-fiber reinforced high-pressure aeration hose made of modified TPEE material, which is highly resistant to hydrolysis and acids and alkalis, allowing for long-term use in chemically corrosive media. It exhibits good environmental stability and a long service life in chemical, textile, food, papermaking, printing and dyeing, brewing, pharmaceutical, and leather industries. The long-fiber reinforcement enhances the bonding strength between the fibers and the modified TPEE material, significantly improving both the hose's pressure-bearing capacity and axial and radial strength. This ensures safe and reliable long-distance use without fear of breakage due to stretching. The composite long-fiber braided structure as a reinforcing layer greatly improves the hose's strength and pressure-bearing capacity. Aeration efficiency can be increased by increasing pressure without altering the orifice size. The hose can be repeatedly wound and recycled, is resistant to deformation, and maintains consistent orifice size with minimal deformation. The invention employs a one-time co-extrusion and flipping process, enabling long-distance extrusion and application of the aeration hose, while maintaining sufficient strength and overall performance to withstand the challenges of long-distance use. Attached Figure Description

[0029] Figure 1 is a process flow diagram of the manufacturing method of long fiber reinforced high pressure aeration hose;

[0030] Figure 2 shows the axial cross-sectional structure of the prefabricated hose obtained after the first two steps and a schematic diagram of the flipping process.

[0031] Figure 3 is a schematic diagram of the radial cross-sectional structure of the prefabricated hose obtained after the first two steps. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Unless otherwise specifically stated, the numerical values ​​set forth in these embodiments do not limit the scope of the invention. Techniques and methods known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques and methods should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] Experimental methods not specified in the following examples are generally performed according to national standards; if there is no corresponding national standard, they are performed according to general standard requirements or general methods.

[0035] The following abbreviations are used for thermoplastic polyester elastomers: TPEE; chlorinated polyethylene: CPE; acrylonitrile-butadiene-styrene terpolymer: ABS; and polyurethane elastomers: TPU.

[0036] Preparation Example 1

[0037] This case study describes the preparation of modified TPEE materials, with the following formulation:

[0038] Modified TPEE material-I comprises the following parts by weight: TPEE 30 parts, CPE 16 parts, ABS 12 parts, polymeric carbodiimide KSJ-936 2 parts, antioxidant 1010 2 parts, molybdenum disulfide 4 parts, light stabilizer 119 0.5 parts, and BASF Irganox 245 0.2 parts;

[0039] The modified TPEE material of the above formulation is prepared by the following steps:

[0040] S21: TPEE, CPE and ABS are dried at 90℃ for 4h respectively, and the CPE and ABS are premixed at 400rpm for 25min to obtain mixture A;

[0041] Meanwhile, the hydrolysis stabilizer, friction reducer, antioxidant, and heat stabilizer are heated and mixed at 40°C for 25 minutes to obtain mixture B;

[0042] S22: Heat and mix the TPEE and the mixture B at 40°C and 400 rpm for 25 min, then add the weathering agent and continue mixing at 40°C and 500 rpm for 10 min to obtain the mixture C;

[0043] S23: Add the mixture C to a twin-screw extruder for melt blending, and add the mixture A from the side feed port. The temperature settings of the twin-screw extruder are as follows: Zone 1: 160°C, Zone 2: 170°C, Zone 3: 175°C, Zone 4: 180°C, Zone 5: 185°C, Zone 6: 190°C, Zone 7: 195°C, Zone 8: 200°C, Zone 9: 205°C, and die head: 210°C. Extrusion and granulation yield modified TPEE material-I.

[0044] Preparation Example 2

[0045] This case study describes the preparation of modified TPEE materials, with the following formulation:

[0046] Modified TPEE material-II comprises the following parts by weight: TPEE 35 parts, CPE 20 parts, ABS 16 parts, polymeric carbodiimide KSJ-936 2.5 parts, antioxidant 1010 2.5 parts, molybdenum disulfide 5 parts, light stabilizer 119 0.7 parts, and BASF Irganox 245 0.3 parts;

[0047] The modified TPEE material of the above formulation is prepared by the following steps:

[0048] S21: TPEE, CPE and ABS are dried at 90℃ for 4 hours respectively, and the CPE and ABS are premixed at 500 rpm for 20 minutes to obtain mixture A;

[0049] Meanwhile, the hydrolysis stabilizer, friction reducer, antioxidant, and heat stabilizer are heated and mixed at 45°C for 20 minutes to obtain mixture B;

[0050] S22: Heat and mix the TPEE and the mixture B at 45°C and 500 rpm for 20 min, then add the weathering agent and continue mixing at 45°C and 500 rpm for 15 min to obtain the mixture C;

[0051] S23: Add the mixture C to a twin-screw extruder for melt blending, and add the mixture A from the side feed port. The temperature settings of the twin-screw extruder are as follows: Zone 1: 160°C, Zone 2: 170°C, Zone 3: 175°C, Zone 4: 180°C, Zone 5: 185°C, Zone 6: 190°C, Zone 7: 195°C, Zone 8: 200°C, Zone 9: 205°C, and die head: 210°C. Extrusion and granulation yield modified TPEE material-II.

[0052] Preparation Example 3

[0053] This case study describes the preparation of modified TPEE materials, with the following formulation:

[0054] Modified TPEE material-III comprises the following parts by weight: TPEE 45 parts, CPE 25 parts, ABS 20 parts, polymeric carbodiimide KSJ-936 4 parts, antioxidant 1010 4 parts, molybdenum disulfide 6 parts, light stabilizer 119 1 part, and BASF Irganox 245 0.5 parts;

[0055] The modified TPEE material of the above formulation is prepared by the following steps:

[0056] S21: TPEE, CPE and ABS are dried at 90℃ for 4 hours respectively, and the CPE and ABS are premixed at 600 rpm for 15 minutes to obtain mixture A;

[0057] Meanwhile, the hydrolysis stabilizer, friction reducer, antioxidant, and heat stabilizer are heated and mixed at 38°C for 30 minutes to obtain mixture B;

[0058] S22: Heat and mix the TPEE and the mixture B at 38°C and 600 rpm for 15 min, then add the weathering agent and continue mixing at 38°C and 600 rpm for 10 min to obtain mixture C;

[0059] S23: Add the mixture C to a twin-screw extruder for melt blending, and add the mixture A from the side feed port. The temperature settings of the twin-screw extruder are as follows: Zone 1: 160°C, Zone 2: 170°C, Zone 3: 175°C, Zone 4: 180°C, Zone 5: 185°C, Zone 6: 190°C, Zone 7: 195°C, Zone 8: 200°C, Zone 9: 205°C, and die head: 210°C. Extrusion and granulation yield modified TPEE material-Ⅲ.

[0060] Example 1

[0061] A method for manufacturing a long fiber reinforced high-pressure aeration hose, the process flow diagram of which is shown in Figure 1, includes the following steps:

[0062] S1. According to the design requirements of DN65 pipe, multi-strand polyester long fibers are used as warp (2DC double warp) and weft (4DC single weft) respectively to form a twill weave (187 warp threads and 58 weft threads) to obtain a tubular strip blank for later use;

[0063] S2. The strip blank is threaded onto the core of the co-extrusion die (the core diameter determines the inner diameter of the hose; the appropriate core is selected according to the corresponding model). At the same time, the dried modified TPEE material-I is drawn into the extruder. The extruder causes the modified TPEE material-I to form a melt extrusion. The extrusion temperature of the extruder is set to 200℃-210℃. After the modified TPEE material-I melts at high temperature, it penetrates into the strip blank through the front die of the co-extrusion die (the front die diameter determines the outer diameter of the hose, thereby controlling the overall hose wall thickness and the amount of overlapping penetration). That is, the two overlap and penetrate in the thickness part of the radial section. After being extruded by the one-time molding co-extrusion penetration process, under the traction of the traction machine, after being cooled by water in the water tank, the modified TPEE material-I forms a hose on the outer surface of the strip blank to its interior thickness. It is then further pulled to the laser drilling equipment for surface drilling and then wound up. The extrusion speed is the same as the traction speed, both set to 450m / h, thereby obtaining the pre-made hose.

[0064] The overall thickness of the resulting prefabricated hose is 1.4 mm, of which the thickness of the hose layer is 0.85 mm, the thickness of the strip layer is 1.0 mm, and the thickness of the overlap between the hose and the strip is 0.45 mm, which means the thickness of the overlap is about 52.9% of the thickness of the hose layer. Its axial cross-sectional structure is shown in Figure 2, and its radial cross-sectional structure is shown in Figure 3. Its structure is: a hose formed of modified TPEE material-Ⅰ on the outside and the strip on the inside. At the same time, the hose and the strip overlap in the thickness of the radial section. Aeration micropores are regularly distributed on the surface of the hose (pore density 1800 / m, pore diameter 0.2 mm, and the distance between two adjacent pores is 1 mm). The depth of the pores is equal to the thickness of the hose layer.

[0065] S3. The prefabricated hose is flipped over using a tape-flipping device to flip its inner and outer surfaces. The flipping process is shown in Figure 2. The final product is a long fiber reinforced high-pressure aeration hose with the following structure: the hose inside serves as a modified TPEE inner lining, the strip blank outside serves as a long fiber braided outer reinforcement layer, and aeration micropores are regularly distributed on the modified TPEE inner lining. The modified TPEE inner lining and the long fiber braided outer reinforcement layer overlap and permeate each other in the thickness portion of the radial cross section. The modified TPEE inner lining has regularly distributed aeration micropores (the arrangement of the pores is described in S2 and will not be repeated here).

[0066] Example 2

[0067] According to the design requirements of DN50 pipe, multi-strand polyester long fibers are used as warp (2DC double warp) and weft (4DC single weft) respectively to form a twill weave (151 warp threads and 58 weft threads) to obtain a tubular strip blank for later use;

[0068] S2. The strip blank is threaded onto the core of the co-extrusion die (the core diameter determines the inner diameter of the hose; the appropriate core is selected according to the corresponding model). At the same time, the dried modified TPEE material-II is drawn into the extruder. The extruder causes the modified TPEE material-II to form a melt extrusion. The extrusion temperature of the extruder is set to 200℃-210℃. After the modified TPEE material-II melts at high temperature, it penetrates into the strip blank through the front die of the co-extrusion die (the front die diameter determines the outer diameter of the hose, thereby controlling the overall wall thickness of the hose and the amount of overlapping penetration). That is, the two overlap and penetrate in the thickness part of the radial section. After being extruded by the one-time molding co-extrusion process, under the traction of the traction machine, after being cooled by water in the water tank, the modified TPEE material-II forms a hose on the outer surface of the strip blank to its interior thickness. It is then further pulled to the laser drilling equipment for surface drilling and then wound up. The extrusion speed is the same as the traction speed, both set to 450m / h, thereby obtaining the pre-made hose.

[0069] The overall thickness of the resulting prefabricated hose is 1.2 mm, of which the thickness of the hose layer is 0.75 mm, the thickness of the strip layer is 0.85 mm, and the thickness of the overlap between the hose and the strip is 0.40 mm, which means the thickness of the overlap is about 53.3% of the thickness of the hose layer. Its axial cross-sectional structure is shown in Figure 2, and its radial cross-sectional structure is shown in Figure 3. Its structure is: the hose formed by the modified TPEE material-Ⅱ is on the outside, and the strip is on the inside. At the same time, the hose and the strip overlap in the thickness of the radial section. Aeration micropores are regularly distributed on the surface of the hose (pore density 1600 / m, pore diameter 0.2 mm, and the distance between two adjacent pores is 1 mm). The depth of the pores is equal to the thickness of the hose layer.

[0070] S3. The prefabricated hose is flipped over using a tape-flipping device to flip its inner and outer surfaces. The flipping process is shown in Figure 2. The final product is a long fiber reinforced high-pressure aeration hose with the following structure: the hose inside serves as a modified TPEE inner lining, the strip blank outside serves as a long fiber braided outer reinforcement layer, and aeration micropores are regularly distributed on the TPEE inner lining. The modified TPEE inner lining and the long fiber braided outer reinforcement layer overlap and permeate each other in the thickness portion of the radial section. The modified TPEE inner lining has regularly distributed aeration micropores (the arrangement of the pores is described in S2 and will not be repeated here).

[0071] Example 3

[0072] According to the design requirements of DN76 pipe, multi-strand polyester long fibers are used as warp (2DC double warp) and weft (6DC single weft) respectively to form a twill weave (217 warp threads and 58 weft threads) to obtain a tubular strip blank for later use;

[0073] S2. The strip blank is threaded onto the core of the co-extrusion die (the core diameter determines the inner diameter of the hose, and the appropriate core is selected according to the corresponding model). At the same time, the dried modified TPEE material-III is sucked into the extruder. The extruder causes the modified TPEE material-III to form a melt extrusion. The extrusion temperature of the extruder is set to 200℃-210℃. After the modified TPEE material-III melts at high temperature, it penetrates into the strip blank through the front die of the co-extrusion die (the front die diameter determines the outer diameter of the hose, thereby controlling the overall hose wall thickness and the amount of overlapping penetration). That is, the two overlap and penetrate in the thickness part of the radial section. After being extruded by the one-time molding co-extrusion penetration process, under the traction of the traction machine, after being cooled by water in the water tank, the modified TPEE material-III forms a hose on the outer surface of the strip blank to its inner part. It is then pulled to the laser drilling equipment for surface drilling and then wound up. The extrusion speed is the same as the traction speed, both set to 450m / h, thereby obtaining the pre-made hose.

[0074] The overall thickness of the resulting prefabricated hose is 1.6 mm, of which the thickness of the hose layer is 1.0 mm, the thickness of the strip layer is 1.15 mm, and the thickness of the overlap between the hose and the strip is 0.55 mm, that is, the thickness of the overlap is about 55% of the thickness of the hose layer. Its axial cross-sectional structure is shown in Figure 2, and its radial cross-sectional structure is shown in Figure 3. Its structure is: the hose formed by modified TPEE material-Ⅲ is on the outside, and the strip is on the inside. At the same time, the hose and the strip overlap in the thickness of the radial section. Aeration micropores are regularly distributed on the surface of the hose (pore density 2000 / m, pore diameter 0.2 mm, and the distance between two adjacent pores is 1 mm). The depth of the pores is equal to the thickness of the hose layer.

[0075] S3. The prefabricated hose is flipped over using a tape-flipping device to flip its inner and outer surfaces. The flipping process is shown in Figure 2. This results in a long-fiber reinforced high-pressure aeration hose with the following structure: the inner part of the hose serves as a modified TPEE inner lining, the outer part of the strip serves as a long-fiber braided outer reinforcement layer, and aeration micropores are regularly distributed on the TPEE inner lining. The modified TPEE inner lining and the long-fiber braided outer reinforcement layer overlap and permeate each other in their radial cross-sectional thickness. The modified TPEE inner lining has regularly distributed aeration micropores (the arrangement of the pores is described in S2 and will not be repeated here).

[0076] Comparative Example 1

[0077] This case study uses a single-layer TPU hose with no fiber braided reinforcement layer and an overall wall thickness of 1.0 mm. The aeration micropore parameters are the same as in Example 1 (pore depth = hose wall thickness 1.0 mm).

[0078] The material composition of the TPU hose is the same as that of Preparation Example 1, except that it does not contain CPE and ABS, and the weight parts of CPE and ABS are added to the weight parts of TPU.

[0079] Comparative Example 2

[0080] This case study uses a single-layer TPEE hose with no fiber braided reinforcement layer and an overall wall thickness of 1.0 mm. The aeration micropore parameters are the same as in Example 1 (pore depth is the same as in Comparative Example 1).

[0081] The material composition of the TPEE hose is the same as that of Preparation Example 1, except that it does not contain CPE and ABS, and the weight parts of CPE and ABS are added to the weight parts of TPEE.

[0082] Comparative Example 3

[0083] The preparation process in this case is the same as in Example 1, except that S2 does not use a one-time co-extrusion process. Instead, modified TPEE material-I is coated onto the surface of the strip blank. The coating is applied to the surface of the strip blank after being melted at high temperature using a coating device. Subsequent operations such as drilling and flipping are the same as in Example 1, resulting in a final product wall thickness of 1.6 mm. It was observed that the coating material in this case did not penetrate into the strip blank.

[0084] Comparative Example 4

[0085] The preparation process in this case is the same as in Example 1. The difference is that the overall thickness of the pre-formed hose is 1.3 mm by adjusting the front die diameter of the co-extrusion die. The thickness of the hose layer is 0.85 mm, the thickness of the strip layer is 1.0 mm, and the thickness of the overlap between the hose and the strip is 0.55 mm. That is, the thickness of the overlap is about 64.7% of the thickness of the hose layer.

[0086] Comparative Example 5

[0087] The preparation process in this case is the same as in Example 1. The difference is that the overall thickness of the pre-formed hose is 1.55 mm by adjusting the front die diameter of the co-extrusion die. The thickness of the hose layer is 0.85 mm, the thickness of the strip layer is 1.0 mm, and the thickness of the overlap between the hose and the strip is 0.3 mm. That is, the thickness of the overlap is about 35.3% of the thickness of the hose layer.

[0088] After aerating the above-mentioned aeration hoses in an acidic medium for 168h, 336h, 504h, and 672h, samples were taken to test the physical properties of the samples (test reference standard GBT528-1998), including tensile strength, elongation, and hardness change rate. The change rate of physical properties was calculated, and the results are shown in Table 1. The aeration efficiency was tested by pressurization (test reference standard JB / T 11378-2013), and the results are shown in Table 2.

[0089] Table 1 Comparison of physical properties after aeration in each case

[0090] As shown in Table 1, comparing Example 1 with Comparative Examples 1-2, although the initial strength of Comparative Examples 1-2 is higher than that of Example 1, the strength change rate of the hoses in Comparative Examples 1-2 decreases significantly after immersion in acidic media for 168 to 672 hours. Comparing Example 1 with Comparative Example 3, the process of coating modified TPEE material onto the surface of long fibers in Comparative Example 3, and the lack of control over the thickness of overlapping penetration in Comparative Examples 4 and 5 within the range of 50%-60% of the inner lining thickness, all resulted in a higher strength change rate under the same acidic media environment. However, when preparing aeration hoses of the same specifications, the pressure-bearing capacity of Example 1 of the present invention is greatly improved. Under the same usage environment, the strength change rate of the present invention under acidic media is lower. The present invention, which uses TPEE material composite long fiber reinforcement, has better stability under acidic conditions.

[0091] Table 2 Aeration efficiency of each case

[0092] As shown in Table 2, the different material compositions of Comparative Examples 1 and 2 resulted in lower aeration efficiency compared to Example 1. The different attachment processes of the modified TPEE material in Comparative Example 3, and the fact that the overlapping penetration thickness of Comparative Examples 4 and 5 was outside the range of 50%-60% of the inner lining thickness, all failed to achieve good aeration effects. This invention, by combining the modified TPEE material with long fibers and controlling the overlapping penetration thickness within the range of 50%-60% of the inner lining thickness, significantly improves the overall pressure-bearing capacity of the hose. Through pressurization, hoses of the same diameter can achieve higher aeration efficiency.

[0093] The aeration hose manufactured by the method of this invention not only has higher aeration efficiency, but also has better stability under acidic conditions.

[0094] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A long fiber reinforced high-pressure aeration hose, characterized in that, It includes a long fiber woven outer reinforcing layer and a modified TPEE inner liner layer, wherein the modified TPEE inner liner layer and the long fiber woven outer reinforcing layer overlap and permeate in the thickness portion of the radial cross section, and the modified TPEE inner liner layer has regularly distributed aeration micropores. The thickness of the overlapping infiltration is in the range of 50%-60% of the thickness of the modified TPEE liner.

2. The long fiber reinforced high-pressure aeration hose according to claim 1, characterized in that, The modified TPEE inner liner is made of modified TPEE material, which includes the following main materials in parts by weight: 30-50 parts of thermoplastic polyester elastomer, 15-25 parts of chlorinated polyethylene, and 10-20 parts of acrylonitrile-butadiene-styrene terpolymer.

3. The long fiber reinforced high-pressure aeration hose according to claim 2, characterized in that, The modified TPEE material also includes the following auxiliary materials in parts by weight: 2-4 parts hydrolysis stabilizer, 2-5 parts antioxidant, 4-6 parts friction reducer, 0.5-1 part weathering agent, and 0.2-0.5 parts heat stabilizer.

4. The long fiber reinforced high-pressure aeration hose according to claim 3, characterized in that, The hydrolytic stabilizer is a polymeric carbodiimide; the antioxidant is antioxidant 1010; the friction reducer is selected from one or more of molybdenum disulfide and graphite, with a particle size of less than 0.5 mm; the weathering agent is light stabilizer 119; and the heat stabilizer is BASF Irganox 245.

5. A long fiber reinforced high-pressure aeration hose according to any one of claims 1-4, characterized in that, The long fiber braided outer reinforcement layer is made by braiding long fibers into a tubular strip blank from warp and weft according to design requirements. The long fibers are selected from one or more of polyester fibers, aramid fibers, and continuous carbon fibers. The thickness of the modified TPEE liner is in the range of 0.7 mm to 2 mm.

6. A long fiber reinforced high-pressure aeration hose according to any one of claims 1-4, characterized in that, The long fiber reinforced high-pressure aeration hose has 1,500 to 3,000 aeration micropores distributed per meter; the diameter of the aeration micropores is in the range of 0.15 mm to 0.25 mm.

7. A method for manufacturing a long fiber reinforced high-pressure aeration hose according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Long fibers are woven into tubular strip blanks from warp and weft according to design requirements, ready for use; S2. The strip blank is threaded onto the core of the co-extrusion die, and the dried modified TPEE material is simultaneously drawn into the extruder. The extruder causes the modified TPEE material to form a melt extrusion, and the melt penetrates into the strip blank through the front die of the co-extrusion die. That is, the two overlap and penetrate in the thickness part of the radial section. After one-time co-extrusion penetration extrusion, under the action of traction, after cooling and surface laser perforation, it is wound up to obtain a pre-made hose. S3. The prefabricated hose is flipped over using a turning device to form a long fiber reinforced high-pressure aeration hose, the structure of which is: The modified TPEE material is used as the inner lining layer, the strip blank is used as the outer long fiber woven reinforcement layer, and aeration micropores are regularly distributed on the modified TPEE inner lining layer. The modified TPEE inner lining layer and the long fiber woven reinforcement layer overlap and permeate each other, and the thickness of the overlap and permeation is in the range of 50%-60% of the thickness of the modified TPEE inner lining layer.

8. The method for manufacturing the long fiber reinforced high-pressure aeration hose according to claim 7, characterized in that, The modified TPEE material is produced by the following steps: S21: Dry the thermoplastic polyester elastomer, chlorinated polyethylene, and acrylonitrile-butadiene-styrene terpolymer separately, and premix the chlorinated polyethylene and the acrylonitrile-butadiene-styrene terpolymer to obtain mixture A; Simultaneously, hydrolysis stabilizer, friction reducer, antioxidant, and heat stabilizer are premixed to obtain mixture B; S22: The thermoplastic polyester elastomer is heated and mixed with the mixture B, and then a weather-resistant agent is added and mixed to obtain mixture C; S23: The mixture C is melt-blended, and the mixture A is added from the side feed port. The mixture is then extruded and granulated to obtain the modified TPEE material.

9. The method for manufacturing the long fiber reinforced high-pressure aeration hose according to claim 8, characterized in that, The heating and mixing temperature is 35℃-45℃; the mixing rate of the entire steps S21 and S22 is 300rpm-600rpm, and the mixing time is at least 10min; The melt blending described in S23 is carried out in a twin-screw extruder, and the temperature settings of the twin-screw extruder are as follows: Zone 1: 160°C, Zone 2: 170°C, Zone 3: 175°C, Zone 4: 180°C, Zone 5: 185°C, Zone 6: 190°C, Zone 7: 195°C, Zone 8: 200°C, Zone 9: 205°C, and Die Head: 210°C.

10. The method for manufacturing the long fiber reinforced high-pressure aeration hose according to claim 7, characterized in that, The extrusion temperature of the modified TPEE material formed by the extruder in S2 is 200℃-210℃.

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