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

Abstract

The present invention relates to the technical field of high-pressure aeration hoses, and specifically relates to a long-fiber reinforced high-pressure aeration hose and a manufacturing method thereof, including 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 penetrate in the thickness of the radial cross-section. The modified TPEE inner lining layer has regularly distributed aeration micropores; wherein the thickness ratio of the overlapping penetration ranges from 50% to 60% of the thickness of the modified TPEE inner lining layer. By using a composite long-fiber braided structure as the reinforcement layer, the present invention greatly improves the strength of the aeration hose, and at the same time significantly enhances the pressure-bearing capacity of the aeration hose. Without changing the size of the holes, the aeration efficiency can be improved by increasing the pressure, and it can also be repeatedly wound up and recycled, and the hose is not easily deformed. The present invention adopts a one-step forming co-extrusion penetration and flipping process, enabling the aeration hose to be extruded and applied over a long distance, and the tube body has better strength and comprehensive performance.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure aeration hoses, and particularly to a long fiber-reinforced high-pressure aeration hose and a manufacturing method thereof. Background Art

[0002] Aeration hoses are widely used in biochemical treatment projects for industrial wastewater and urban domestic sewage such as petrochemical, textile, food, paper-making, printing and dyeing, brewing, pharmaceutical, leather-making industries, etc. When the efficiency of the existing aerators is low or they are frequently blocked, aeration hoses can be used for transformation to improve the oxygenation capacity and agitation effect. It is also used in the circulating water of aquaculture, high-density aquaculture systems and oxygenation of ordinary fish ponds. It is also used in sewage regulating ponds to prevent large particle sedimentation and can remove some organic matter.

[0003] Traditional aeration hoses are made of single-layer TPU polyurethane material (prior arts such as CN103663749B, CN201914968U, etc.). This single-layer material has low pressure resistance and low aeration efficiency. After repeated winding and unwinding, the elongation rate of TPU gradually increases, causing the aeration holes on it to expand, resulting in the failure of the aeration function; and because TPU has poor hydrolysis and acid-base resistance, it is hydrolyzed and aged relatively quickly when immersed in the aeration pond for a long time, reducing the service life. When the holes are covered by microorganisms and scale after long-term use, the usual cleaning operation is high-pressure cleaning, and once high-pressure cleaning is carried out, the holes on it will expand, also resulting in the failure of the aeration function. In addition, the length of traditional aeration hoses is about 20 meters to 100 meters. Due to the limited strength of single-layer polyurethane, it cannot be used over long distances and is easily stretched, damaged and broken during long-distance practical applications. Summary of the Invention

[0004] In order to solve the technical problems of the existing traditional aeration hoses, such as being prone to deformation, having low pressure resistance, low strength, low aeration efficiency, low environmental stability, and low reliability for long-distance use, a long fiber-reinforced high-pressure aeration hose and a manufacturing method thereof are provided. The hose body manufactured by the method of the present invention has enhanced pressure-bearing capacity, and at the same time, the strength in the axial and radial directions is also greatly improved. Without changing the size of the holes, the aeration efficiency can be increased by increasing the pressure; in addition, when laying and applying over long distances, there is no need to worry about being stretched and broken, and it can also be used in chemically corrosive media for a long time, with good environmental stability.

[0005] In order to achieve the above object, the present invention is realized through the following technical solutions:

[0006] A long fiber-reinforced high-pressure aeration hose includes 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 overlap and penetrate in the thickness part of the radial cross-section, and the modified TPEE inner lining layer has regularly distributed aeration micropores;

[0007] Wherein the thickness ratio of the overlapping penetration ranges from 50% to 60% of the thickness of the modified TPEE inner liner layer. The more the thickness of the overlapping penetration, the higher the interlayer peel strength. However, the more the overlapping penetration part, the thinner the remaining rubber hose (i.e., the inner liner layer), which will correspondingly reduce the tensile strength. Therefore, it is better that the thickness of the overlapping penetration is within the range of 50% - 60%.

[0008] Further, the material of the modified TPEE inner liner layer is a modified TPEE material, and the modified TPEE material 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 of hydrolysis stabilizer, 2 - 5 parts of antioxidant, 4 - 6 parts of antifriction agent, 0.5 - 1 part of weathering agent, and 0.2 - 0.5 part of heat stabilizer.

[0010] Preferably, the hydrolysis 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 antifriction agent is selected from one or more of molybdenum disulfide and graphite, with a particle size less than 0.5 mm; the weathering agent is light stabilizer 119; and the heat stabilizer is BASF Irganox245.

[0011] Further, the long - fiber braided outer reinforcement layer is formed by weaving long fibers into a tubular blank according to design requirements (such as diameter, pressure, etc.) with warp and weft. The long fibers are selected from one or more of polyester fibers, aramid fibers, and continuous carbon fibers.

[0012] Further, the thickness of the modified TPEE inner liner layer is within the range of 0.7 mm - 2 mm.

[0013] Further, 1500 to 3000 of the aeration micropores are distributed per meter on the long - fiber - reinforced high - pressure aeration hose; the hole diameter of the aeration micropores is 0.2 mm - 0.25 mm, and the depth of the aeration micropores is the thickness of the modified TPEE inner liner layer.

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

[0015] S1. Weave long fibers into a tubular blank according to design requirements with warp and weft for standby;

[0016] S2. Thread the strip blank onto the die core of the coextrusion die. At the same time, suck the dried modified TPEE material into the extruder. The extruder forms the modified TPEE material into a melt and extrudes it. The melt penetrates from the outer surface of the strip blank through the front die of the coextrusion die, that is, the two overlap and penetrate in the thickness part of the radial cross-section. After one-time forming and coextrusion penetration extrusion, under the traction, it is cooled, surface laser drilled, and then wound up to obtain a prefabricated hose.

[0017] S3. Use a tape turning device to turn the inner and outer surfaces of the prefabricated hose, and finally form a long fiber reinforced high-pressure aeration hose. Its structure is: the modified TPEE material is used as the modified TPEE inner lining layer inside, the strip blank is used as the long fiber braided outer reinforcement layer outside, and the aeration micropores regularly distributed on the modified TPEE inner lining layer. The modified TPEE inner lining layer and the long fiber braided outer reinforcement layer overlap and penetrate.

[0018] Further, the modified TPEE material is processed through the following steps:

[0019] S21: Dry the thermoplastic polyester elastomer, chlorinated polyethylene, and acrylonitrile-butadiene-styrene terpolymer respectively. Premix the chlorinated polyethylene and the acrylonitrile-butadiene-styrene terpolymer to obtain mixture A.

[0020] At the same time, premix the hydrolysis stabilizer, anti-friction agent, antioxidant, and heat stabilizer to obtain mixture B.

[0021] S22: Heat and mix the thermoplastic polyester elastomer and mixture B, and then add the weather resistance agent and mix to obtain mixture C.

[0022] S23: Carry out melt blending on mixture C, add mixture A from the side feeding port, extrude and pelletize to obtain the modified TPEE material.

[0023] Preferably, the temperature of the heat mixing is 35°C - 45°C; the mixing rate of the overall steps of S21 and S22 is 300 rpm - 600 rpm, and the mixing time is at least 10 min.

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

[0025] Further, the extrusion temperature of the extruder for forming the melt of the modified TPEE material in S2 is 200°C - 210°C.

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

[0027] Beneficial technical effects:

[0028] The long fiber reinforced high-pressure aeration hose of the present invention uses a modified TPEE material, which has strong hydrolysis resistance and is also resistant to acids and alkalis. It can be used in chemically corrosive media for a long time, and has good environmental stability. It has a long service life in environments such as chemical industry, textile, food, paper making, printing and dyeing, brewing, pharmaceutical, and leather making. After being reinforced with long fibers, the bonding strength between the fibers and the modified TPEE material is large, which not only enhances the pressure-bearing capacity of the pipe body, but also greatly improves the strength in the axial and radial directions. When used for long-distance laying, there is no need to worry about being stretched and broken, and it is safe and reliable for long-distance use; through the composite long fiber braided structure as the reinforcing layer, the strength of the aeration hose is greatly improved, and at the same time the pressure-bearing capacity of the aeration hose is greatly increased. Without changing the size of the holes, the aeration efficiency can be improved by increasing the pressure; it can be repeatedly wound and recycled, the hose is not easy to deform, and the size of the holes is consistent with a small deformation; the present invention adopts the one-step co-extrusion and flipping process to enable the aeration hose to be extruded and applied over a long distance, and the strength and comprehensive performance of the pipe body can support the challenges faced by long-distance use. Description of the drawings

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

[0030] Figure 2 is an axial sectional structure diagram of the prefabricated hose obtained through the first two steps and a diagram of flipping;

[0031] Figure 3 is a radial sectional structure diagram of the prefabricated hose obtained through the first two steps. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments and drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restrictive of the present invention and its application or use. 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.

[0033] Unless otherwise specifically stated, the numerical values set forth in these embodiments do not limit the scope of the present invention. Technologies and methods known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and methods should be regarded as part of the specification. In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limiting. Thus, other examples of the exemplary embodiments may have different values.

[0034] For the experimental methods without specific conditions noted in the following examples, they are generally determined according to national standards; if there are no corresponding national standards, they are carried out according to general standard requirements or general methods.

[0035] Hereinafter, thermoplastic polyester elastomer is abbreviated as TPEE; chlorinated polyethylene is abbreviated as CPE; acrylonitrile-butadiene-styrene terpolymer is abbreviated as ABS; polyurethane elastomer is abbreviated as TPU.

[0036] Preparation Example 1

[0037] This example is for preparing a modified TPEE material, and the formula is as follows:

[0038] The modified TPEE material-I includes the following materials in parts by weight: 30 parts of TPEE, 16 parts of CPE, 12 parts of ABS, 2 parts of polymeric carbodiimide KSJ-936, 2 parts of antioxidant 1010, 4 parts of molybdenum disulfide, 0.5 part of light stabilizer 119, and 0.2 part of BASF Irganox245;

[0039] The preparation method of the modified TPEE material with the above formula is processed by the following steps:

[0040] S21: Respectively dry TPEE, CPE, and ABS at 90 °C for 4 h, and premix the CPE and the ABS at 400 rpm for 25 min to obtain mixture A;

[0041] At the same time, heat and mix the hydrolysis stabilizer, antiwear agent, antioxidant, and heat stabilizer at 40 °C for 25 min 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 to mix at 40 °C and 500 rpm for 10 min to obtain mixture C;

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

[0044] Preparation Example 2

[0045] This example is for preparing a modified TPEE material, and the formula is as follows:

[0046] The modified TPEE material-II includes the following materials in parts by weight: 35 parts of TPEE, 20 parts of CPE, 16 parts of ABS, 2.5 parts of polymeric carbodiimide KSJ-936, 2.5 parts of antioxidant 1010, 5 parts of molybdenum disulfide, 0.7 part of light stabilizer 119, and 0.3 part of BASF Irganox245;

[0047] The preparation method of the modified TPEE material with the above formula includes the following steps:

[0048] S21: Dry TPEE, CPE, and ABS at 90 °C for 4 hours respectively. Premix the CPE and the ABS at 500 rpm for 20 minutes to obtain the mixture A;

[0049] At the same time, heat and mix the hydrolysis stabilizer, anti-wear agent, antioxidant, and heat stabilizer at 45 °C for 20 minutes to obtain the mixture B;

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

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

[0052] Preparation Example 3

[0053] This example is for preparing a modified TPEE material, and the formula is as follows:

[0054] The modified TPEE material - Ⅲ comprises the following materials in parts by weight: 45 parts of TPEE, 25 parts of CPE, 20 parts of ABS, 4 parts of polymeric carbodiimide KSJ - 936, 4 parts of antioxidant 1010, 6 parts of molybdenum disulfide, 1 part of light stabilizer 119, 0.5 part of BASF Irganox245;

[0055] The preparation method of the modified TPEE material with the above formula is processed through the following steps:

[0056] S21: Respectively dry TPEE, CPE, and ABS at 90°C for 4 hours, and premix the CPE and the ABS at 600 rpm for 15 minutes to obtain mixture A;

[0057] Meanwhile, heat - mix the hydrolysis stabilizer, anti - wear agent, antioxidant, and heat stabilizer at 38°C for 30 minutes to obtain mixture B;

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

[0059] S23: Add the mixture C into a twin - screw extruder for melt - blending, and add the mixture A from the side - feeding port. The temperature settings of the twin - screw extruder are as follows: the temperature of the first zone is 160°C, the second zone is 170°C, the third zone is 175°C, the fourth zone is 180°C, the fifth zone is 185°C, the sixth zone is 190°C, the seventh zone is 195°C, the eighth zone is 200°C, the ninth zone is 205°C, and the head is 210°C. Extrude and pelletize to obtain the modified TPEE material - Ⅲ.

[0060] Example 1

[0061] A manufacturing method of a long - fiber - reinforced high - pressure aeration hose, the process flow chart is as Figure 1 shown, and it comprises the following steps:

[0062] S1. According to the design requirements of the DN65 - type pipe, use multi - strand polyester long fibers as the warp (2DC double warp) and weft (4DC single weft) respectively for twill weaving (warp density 187 roots, weft density 58 roots) to obtain a tubular tape blank for later use;

[0063] S2, the strip blank is passed through the core of the co-extrusion die (the core diameter determines the inner diameter of the hose, and the corresponding core is selected according to the corresponding model), and the dried modified TPEE material-I is sucked into the extruder at the same time, and the extruder causes the modified TPEE material-I to form a melt extrusion, and the extrusion temperature of the extruder is set to 200℃-210℃. After the modified TPEE material-I is melted at high temperature, it penetrates into the strip blank through the front die of the co-extrusion die (the front die caliber determines the outer diameter of the hose, thereby controlling the overall hose wall thickness and the overlapping penetration amount), that is, the thickness of the two parts overlap and penetrate in the radial section, and the modified TPEE material-I is extruded by the one-time molding co-extrusion penetration process. Under the traction of the traction machine, the modified TPEE material-I is cooled by the water tank to form a rubber hose from the outer surface of the strip blank to its inner part thickness, and then it is continuously pulled to the laser punching equipment for surface punching and then rolled up. The extrusion speed is consistent with the traction speed, both set to 450m / h, thereby obtaining a prefabricated hose;

[0064] The overall thickness of the obtained prefabricated hose is 1.4mm, of which the thickness of the entire hose layer is 0.85mm, the thickness of the entire strip layer is 1.0mm, and the overlapping penetration thickness of the hose and the strip is 0.45mm, that is, the overlapping penetration thickness is about 52.9% of the entire hose layer thickness. The schematic diagram of its axial section structure is shown in Figure 2 The radial cross-sectional structure diagram is shown in Figure 3 As shown, its structure is: the rubber tube formed by the modified TPEE material-Ⅰ is outside and the strip blank is inside, and the thickness of the rubber tube and the strip blank in the radial section partially overlaps and penetrates, and aeration micropores are regularly distributed on the surface of the rubber tube (hole density is 1800 / m, hole diameter is 0.2mm, and the spacing between two adjacent holes is 1mm), and the depth of the hole is equal to the thickness of the entire layer of the rubber tube;

[0065] S3, the prefabricated hose is turned over on the inner and outer surfaces by using a belt turning device. The turning process is shown in Figure 2 , and finally a long fiber reinforced high-pressure aeration hose is formed, whose structure is: the rubber hose is used as a modified TPEE inner lining layer inside, the strip blank is used as a long fiber braided outer reinforcement layer outside, 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 reinforcement layer overlap and penetrate in thickness in the radial section, and the modified TPEE inner lining layer 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 the DN50 model tube, multiple strands of polyester long fibers are used as warp (2DC double warp) and weft (4DC single weft) for twill weaving (warp density 151, weft density 58) to obtain a cylindrical strip blank for standby use;

[0068] S2, pass the strip blank on the core of the co-extrusion die (the core diameter determines the inner diameter of the hose, and the corresponding core is selected according to the corresponding model), and at the same time, suck the dried modified TPEE material-II into the extruder, and the extruder causes the modified TPEE material-II to form a melt extrusion, and the extrusion temperature of the extruder is set to 200℃-210℃. After the modified TPEE material-II is melted at high temperature, it penetrates into the strip blank through the front die of the co-extrusion die (the front die caliber 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 thickness of the two parts overlap and penetrate in the radial section, and after being extruded by a one-time co-extrusion process, under the traction of the traction machine, the modified TPEE material-II is water-cooled in a water tank to form a hose from the outer surface of the strip blank to its inner part thickness, and then continues to be pulled to the laser punching equipment for surface punching and then rolled up, and the extrusion speed is consistent with the traction speed, both set to 450m / h, thereby obtaining a prefabricated hose;

[0069] The overall thickness of the obtained prefabricated hose is 1.2mm, of which the thickness of the entire hose layer is 0.75mm, the thickness of the entire strip layer is 0.85mm, and the overlapping penetration thickness of the hose and the strip is 0.40mm, that is, the overlapping penetration thickness is about 53.3% of the thickness of the entire hose layer. The schematic diagram of its axial section structure is shown in Figure 2 The radial cross-sectional structure diagram is shown in Figure 3 As shown, its structure is: the rubber tube formed by the modified TPEE material-II is outside and the strip blank is inside, and the thickness of the rubber tube and the strip blank in the radial section partially overlaps and penetrates, and aeration micropores are regularly distributed on the surface of the rubber tube (pore density is 1600 / m, hole diameter is 0.2mm, and the spacing between two adjacent holes is 1mm), and the depth of the hole is equal to the thickness of the entire layer of the rubber tube;

[0070] S3, the prefabricated hose is turned over on the inner and outer surfaces by using a belt turning device. The turning process is shown in Figure 2 , and finally a long fiber reinforced high-pressure aeration hose is formed, whose structure is: the rubber hose is used as a modified TPEE inner lining layer inside, the strip blank is used as a long fiber braided outer reinforcement layer outside, and aeration micropores are regularly distributed on the TPEE inner lining layer, the modified TPEE inner lining layer and the long fiber braided outer reinforcement layer overlap and penetrate in thickness in the radial section, and the modified TPEE inner lining layer 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 the DN76 model tube, multiple strands of polyester long fibers are used as warp (2DC double warp) and weft (6DC single weft) for twill weaving (warp density 217, weft density 58) to obtain a cylindrical strip blank for standby use;

[0073] S2. Thread the strip blank onto the die core of the co-extrusion die (the diameter of the die core determines the inner diameter of the hose, and select the corresponding die core according to the corresponding model). At the same time, suck the dry modified TPEE material - III into the extruder. The extruder melts and extrudes the modified TPEE material - III. The extrusion temperature of the extruder is set at 200°C - 210°C. After the modified TPEE material - III is melted at high temperature, it penetrates into the strip blank through the front die of the co-extrusion die (the diameter of the front die determines the outer diameter of the hose, thereby controlling the overall wall thickness of the hose and the overlapping penetration amount), that is, the thickness parts of the two overlap and penetrate in the radial cross-section. After being extruded by the one-step co-extrusion penetration process and under the traction of the tractor, after water cooling in the water tank, the modified TPEE material - III forms a rubber tube on the outer surface of the strip blank to a certain thickness inside it. Then it is continuously 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 at 450 m / h, so as to obtain a prefabricated hose;

[0074] The overall thickness of the obtained prefabricated hose is 1.6 mm, of which the overall thickness of the rubber tube is 1.0 mm, the overall thickness of the strip blank is 1.15 mm, and the overlapping penetration thickness of the rubber tube and the strip blank is 0.55 mm, that is, the overlapping penetration thickness is about 55% of the overall thickness of the rubber tube. Its axial sectional structure schematic diagram is as shown in Figure 2 shown, and its radial sectional structure schematic diagram is as shown in Figure 3 shown. Its structure is: a rubber tube formed by the modified TPEE material - III is on the outside, and the strip blank is on the inside. At the same time, the thickness parts of the rubber tube and the strip blank overlap and penetrate in the radial cross-section. Aeration micropores are regularly distributed on the surface of the rubber tube (the pore density is 2000 per meter, the pore diameter is 0.2 mm, and the distance between adjacent two pores is 1 mm), and the depth of the pores is equal to the overall thickness of the rubber tube;

[0075] S3. Use a tape turning device to turn the inner and outer surfaces of the prefabricated hose. For the turning process, refer to Figure 2 . Finally, a long fiber-reinforced high-pressure aeration hose is formed. Its structure is: the rubber tube is on the inside as the modified TPEE inner lining layer, the strip blank is on the outside as the long fiber braided outer reinforcement layer, and the aeration micropores are regularly distributed on the TPEE inner lining layer. The thickness parts of the modified TPEE inner lining layer and the long fiber braided outer reinforcement layer overlap and penetrate in the radial cross-section. The modified TPEE inner lining layer has regularly distributed aeration micropores (the pore arrangement is as described in S2 and will not be elaborated here).

[0076] Comparative Example 1

[0077] This case is only a single-layer TPU hose without a fiber braided reinforcement layer. The overall wall thickness is 1.0 mm, and the aeration micropore parameters are the same as those in Example 1 (the pore depth = the wall thickness of the rubber tube 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 have CPE and ABS, and the weight parts of CPE and ABS are supplemented to the weight parts of TPU.

[0079] Comparative Example 2

[0080] This case is only a single-layer TPEE hose without a fiber braided reinforcement layer. The overall wall thickness is 1.0 mm, and the aeration micropore parameters are the same as those in Example 1 (the pore depth is the same as that 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 have CPE and ABS, and the weight parts of CPE and ABS are supplemented to the weight parts of TPEE.

[0082] Comparative Example 3

[0083] The preparation process of this case is the same as that of Example 1, except that in S2, the one-step co-extrusion process is not used. Instead, a modified TPEE material-I is coated on the surface of the green tube. After being melted at high temperature by a coating device, it is coated on the surface of the green tube. The subsequent operations such as punching and flipping are the same as those in Example 1, so that the final product has a wall thickness of 1.6 mm. It is observed that the sprayed material in this case does not penetrate into the green tube.

[0084] Comparative Example 4

[0085] The preparation process of this case is the same as that of Example 1, except that by adjusting the caliber of the front die of the co-extrusion die, the overall thickness of the obtained prefabricated hose is 1.3 mm, where the overall thickness of the rubber tube layer is 0.85 mm, the overall thickness of the green tube layer is 1.0 mm, and the overlapping and penetrating thickness of the rubber tube and the green tube is 0.55 mm, that is, the overlapping and penetrating thickness is about 64.7% of the overall thickness of the rubber tube layer.

[0086] Comparative Example 5

[0087] The preparation process of this case is the same as that of Example 1, except that by adjusting the caliber of the front die of the co-extrusion die, the overall thickness of the obtained prefabricated hose is 1.55 mm, where the overall thickness of the rubber tube layer is 0.85 mm, the overall thickness of the green tube layer is 1.0 mm, and the overlapping and penetrating thickness of the rubber tube and the green tube is 0.3 mm, that is, the overlapping and penetrating thickness is about 35.3% of the overall thickness of the rubber tube layer.

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

[0089] Table 1 Comparison of Physical Properties after Aeration for Each Case

[0090]

[0091] As can be seen from Table 1, when comparing Example 1 with Comparative Examples 1-2, although the initial strength of both Comparative Examples 1-2 is higher than that of Example 1, after being soaked in an acidic medium for 168 hours to 672 hours, the strength change rate of the hoses in Comparative Examples 1-2 decreases significantly; when comparing Example 1 with Comparative Example 3, the process of coating the modified TPEE material on the surface of long fibers in Comparative Example 3, and in Comparative Examples 4 and 5, the thickness of the overlapping penetration is not controlled within the range of 50%-60% of the inner liner layer thickness. In the same acidic medium environment, the strength change rates are all relatively high. However, when manufacturing aeration hoses of the same specifications, the pressure-bearing capacity of Example 1 of the present invention is greatly improved. In the same usage environment, the strength change rate of the present invention in an acidic medium is lower. The present invention uses a composite of TPEE material and long fibers to enhance the stability under acidic conditions.

[0092] Table 2 Aeration Efficiency of Each Case

[0093]

[0094] As can be seen from Table 2, the different compositions of the materials in Comparative Examples 1 and 2 result in worse aeration efficiency compared to Example 1; the different attachment processes of the modified TPEE material in Comparative Example 3, and the thickness of the overlapping penetration outside the range of 50%-60% of the inner liner layer thickness in Comparative Examples 4 and 5 cannot achieve good aeration effects. The present invention combines the modified TPEE material with long fibers and controls the thickness of the overlapping penetration within the range of 50%-60% of the inner liner layer thickness, which greatly improves the pressure-bearing capacity of the overall hose. Through pressurization, hoses of the same caliber can achieve higher aeration efficiency.

[0095] The aeration hose manufactured by the method of the present invention not only has higher aeration efficiency but also has better stability under acidic conditions.

[0096] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A long fiber reinforced high pressure aeration hose, characterized in that: It includes a long fiber braided outer reinforcement layer and a modified TPEE inner lining layer, wherein the modified TPEE inner lining layer and the long fiber braided outer reinforcement layer partially overlap and penetrate in thickness in a radial cross section, and the modified TPEE inner lining layer has regularly distributed aeration micropores; The thickness of the overlapping penetration accounts for 50%-60% of the thickness of the modified TPEE liner; The material of the modified TPEE lining layer is a modified TPEE material, and the modified TPEE material includes the following main materials in parts by weight: 30 parts to 50 parts of thermoplastic polyester elastomer, 15 parts to 25 parts of chlorinated polyethylene, and 10 parts to 20 parts of acrylonitrile-butadiene-styrene terpolymer.

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

3. A long fiber reinforced high pressure aeration hose according to claim 2, characterized in that: The hydrolysis stabilizer is polymeric carbodiimide; the antioxidant is antioxidant 1010; the friction reducer is selected from one or more of molybdenum disulfide and graphite, and the particle size is less than 0.5 mm; the weathering agent is light stabilizer 119; and the heat stabilizer is BASF Irganox245.

4. A long fiber reinforced high pressure aeration hose according to any one of claims 1 to 3, characterized in that: The long fiber braided outer reinforcement layer is made of long fibers woven into a cylindrical strip by warp and weft according to design requirements, and the long fibers are selected from one or more of polyester fibers, aramid fibers, and continuous carbon fibers; the thickness of the modified TPEE lining layer is in the range of 0.7mm-2mm.

5. A long fiber reinforced high pressure aeration hose according to any one of claims 1 to 3, characterized in that: The number of aeration micropores in the range of 1500 to 3000 is distributed per meter on the long fiber reinforced high-pressure aeration hose; the hole diameter of the aeration micropores is in the range of 0.15 mm to 0.25 mm.

6. A method for manufacturing a long fiber reinforced high pressure aeration hose, applicable to a long fiber reinforced high pressure aeration hose as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1, using long fibers to weave warp and weft into a cylindrical strip blank according to design requirements, and waiting for use; S2, passing the strip blank on the core of the co-extrusion die, and at the same time sucking the dried modified TPEE material 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 thickness of the two parts in the radial section overlaps and penetrates, and the co-extrusion penetration extrusion is formed in one time, and then it is cooled and surface laser punched under the action of traction, and then rolled up to obtain a prefabricated hose; S3, the prefabricated hose is turned over on the inner and outer surfaces by using a belt turning device, and finally a long fiber reinforced high-pressure aeration hose is formed, the structure of which is: The modified TPEE material is used as a modified TPEE inner lining layer inside, the strip blank is used as a long fiber woven outer reinforcement layer outside, and aeration micropores are regularly distributed on the modified TPEE inner lining layer. The modified TPEE inner lining layer and the long fiber woven outer reinforcement layer overlap and penetrate, and the thickness of the overlapping penetration accounts for 50%-60% of the thickness of the modified TPEE inner lining layer.

7. The method for manufacturing a long fiber reinforced high pressure aeration hose according to claim 6, characterized in that: The modified TPEE material is processed by the following steps: S21: drying a thermoplastic polyester elastomer, a chlorinated polyethylene, and an acrylonitrile-butadiene-styrene terpolymer respectively, and premixing the chlorinated polyethylene and the acrylonitrile-butadiene-styrene terpolymer to obtain a mixture A; At the same time, premixing the hydrolysis stabilizer, the friction reducing agent, the antioxidant and the heat stabilizer to obtain a mixture B; S22: heating and mixing the thermoplastic polyester elastomer and the mixture B, and then adding a weathering agent and mixing to obtain a mixture C; S23: melt-blending the mixture C, adding the mixture A from a side feed port, extruding and granulating to obtain a modified TPEE material.

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

9. The method for manufacturing a long fiber reinforced high pressure aeration hose according to claim 8, characterized in that: The extrusion temperature of the extruder in S2 for forming a melt of the modified TPEE material is 200°C-210°C.

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