Aeration pipe and method for manufacturing the same

Abstract

The application discloses an aeration pipe, which comprises a hose and a protective layer on the surface of the hose, wherein the protective layer comprises fibers and a modifier, and can effectively improve the mechanical strength and the anti-pollution and anti-blocking performance of the hose.

Description

Technical Field

[0001] This invention relates to an aeration tube and its preparation method. Background Technology

[0002] Aeration is a widely used method in wastewater treatment. Aeration is a process of bringing air and water into strong contact, aiming to dissolve oxygen from the air into the water or to release unwanted gases and volatile substances from the water into the air. In other words, it is a means of promoting the exchange of substances between gases and liquids. It also has other important functions, such as mixing and stirring. All of the above must be accomplished using aerators.

[0003] The aeration pipe is an important component of the aerator. Its working principle is as follows: air enters the aeration pipe through the vent hole of the back cover of the microbubble aeration pipe. The pipe wall is densely covered with many tiny pores. Under the action of pressure difference, the air inside the pipe diffuses out from the pores of the pipe wall, forming many tiny bubbles in the sewage and causing water turbulence, thereby achieving the purpose of dissolving oxygen from the air into the water.

[0004] There are many types of aeration pipes, but two are commonly used: one is a common aeration pipe made of coarse porcelain or corundum sintered together. During the sintering process, this type of pipe has many tiny pores in its wall, which are responsible for producing tiny bubbles. The other type is an aeration (flexible) pipe made of ABS or UPVC. This type of aeration pipe is directly inserted into the air duct through perforations. The flexible, linear aeration ensures even air distribution and creates a vertical circulation, resulting in more uniform mixing. Aeration (flexible) pipes produce small bubbles and have high oxygen utilization and power efficiency. However, aeration (flexible) pipes also have the following disadvantages:

[0005] 1) Biofilm easily adheres to the inside and orifices of aeration (soft) pipes, producing biological slime, which may eventually lead to blockage of some orifices and local pipes. When aeration stops, because the orifices cannot close, under the action of hydraulic static pressure, bottom sediment may enter the aeration pipe through the orifices, which can also easily cause blockage of some orifices and local pipes.

[0006] 2) Compared to conventional rigid pipes, aeration (flexible) pipes, due to the limitations of their material, face challenges in maintaining durability over long-term use, and the flexible pipe itself is also prone to unavoidable contamination. For example, in aeration tanks of activated sludge processes, aeration (flexible) pipes undergo repeated expansion and contraction during shutdowns, and are generally not removed during shutdowns. Therefore, over long-term use, the aeration (flexible) pipes are affected by microbial activity and water erosion, allowing fine sludge to penetrate the material's structure, causing non-removable blockages. Similarly, in oily water bodies in the chemical industry, aeration hoses are easily clogged by oil sludge or adhesive substances, affecting aeration efficiency. Summary of the Invention

[0007] 1. The problem to be solved

[0008] Based on the problems of clogging that exist in the use of aeration (soft) pipes, the present invention provides a new type of aeration pipe. The surface of the aeration pipe has been modified to improve its application effect in industrial water treatment (strength and durability, as well as dirt resistance and anti-clogging performance).

[0009] The present invention also provides a method for modifying aeration pipes.

[0010] 2. Technical Solution

[0011] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0012] According to the purpose of the present invention, a first aspect of the present invention provides an aeration tube comprising a flexible tube and a protective layer on the surface of the flexible tube, the protective layer comprising fibers and a modifier.

[0013] According to any embodiment of the first aspect of the invention, the protective layer of the aeration pipe comprises a fiber layer covering the surface of the hose and a modifier layer covering the surface of the fiber layer.

[0014] An aeration tube according to any embodiment of the first aspect of the present invention, wherein the modifier comprises component one, component two, and component three;

[0015] Component one is any one or two of polydimethylsiloxane and hexadecyltrimethoxysilane.

[0016] The second component is nano-silica.

[0017] The third component is any one or two or more of sodium carboxylated cellulose, sodium alginate, and carboxylated chitosan; preferably, the third component includes sodium carboxylated cellulose.

[0018] According to the purpose of this invention, a second aspect of this invention provides a method for preparing an aeration tube, comprising the following steps:

[0019] A. Prepare the hose;

[0020] B. Surface modification of the hose;

[0021] C. Drill holes or slits in the hose to obtain the aeration pipe;

[0022] Wherein, B includes:

[0023] B1. Deposit fibers onto the surface of the hose;

[0024] B2. Apply pressure to the surface to perform a pressurization treatment;

[0025] B3. Bring the modified liquid into contact with the surface treated by B2;

[0026] B4. Apply pressure to the surface treated in B3;

[0027] B5. Dry the surface after B4 treatment.

[0028] A method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, wherein B1 comprises:

[0029] First, the hose is heated to a temperature of 45–70°C; preferably, the heating temperature is 50–55°C.

[0030] Then, the fibers are sprayed onto the surface of the hose.

[0031] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B1, the amount of fiber sprayed is 10-55 g / m. 2 Preferably, the amount of fiber sprayed is 10-25 g / m². 2 .

[0032] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B1, the coating thickness E of the fiber is 0.1 to 0.7 mm; preferably, the coating thickness E of the fiber is 0.2 to 0.5 mm.

[0033] In any embodiment of the second aspect of the present invention, the method for preparing an aeration tube, in B1, is that the surface is in an extended state during fiber spraying.

[0034] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B2, the pressure during the pressurization process is 0.5 to 2 MPa.

[0035] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B2, during the pressurization treatment, the pressurization thickness H1 is set as follows:

[0036] H1=H0+E-Δ (Equation 1)

[0037] in,

[0038] H0 is the wall thickness of the hose described in B1.

[0039] E is the deposition thickness of the fiber described in B1.

[0040] Δ is the adjustment amount, ranging from 0.1 to 1 mm.

[0041] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B2, during the pressurization treatment, the heating temperature of the surface is 45-70°C.

[0042] The pressurization process takes 45-60 seconds.

[0043] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B2, the pressurization treatment is performed by rolling.

[0044] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, in step B2, the surface is in an extended state during the pressurization process.

[0045] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, in step B3, the temperature of the modified liquid is maintained at 45–70°C during contact; preferably, the temperature of the modified liquid is maintained at 50–55°C.

[0046] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, in step B3, the surface is in an extended state during contact.

[0047] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B4, the pressure during the pressurization process is 0.5 to 2 MPa.

[0048] A method for preparing an aeration tube according to any embodiment of the second aspect of the present invention.

[0049] The pressure thickness H3 is set as follows:

[0050] H3 = H2 - Δ (Equation 2)

[0051] in,

[0052] H2 is the wall thickness of the hose after the B2 process is completed; H2 can be equal to...

[0053] Δ is the adjustment amount, ranging from 0.1 to 1 mm;

[0054] The "wall thickness of the hose after processing" mentioned here includes the "wall thickness of the original hose" and the "thickness of the fiber layer deposited and pressurized on the surface of the original hose". In one case, H2 can be considered to be equal to H1 in B2. In another case, it is necessary to consider that the "wall thickness of the hose after processing" may have undergone a slight change before step B4. In this case, H2 may be greater than or less than H1. In this case, H2 is equal to the value measured at the time. Both of the above situations should be understood as the range of values ​​for H2 in this invention.

[0055] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B4, during the pressurization treatment, the heating temperature of the surface is 45-70°C; preferably 50-55°C.

[0056] The pressurization process takes 45-60 seconds.

[0057] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B4, the pressurization treatment is performed by rolling.

[0058] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B4, the surface is in an extended state during the pressurization process.

[0059] In the method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, B5, the temperature of the drying treatment does not exceed 85°C;

[0060] Preferably, the drying temperature does not exceed 70°C;

[0061] Further preferably, the drying temperature is 50–55°C.

[0062] In any embodiment of the second aspect of the present invention, the method for preparing an aeration tube, wherein steps B3. to B5. can be repeated N times, where N is an integer ≥1; preferably, N is an integer from 2 to 5.

[0063] A method for preparing an aeration tube according to any embodiment of the second aspect of the present invention, wherein the modified liquid comprises a modifier: component one, component two, and component three;

[0064] Component one is any one or two of polydimethylsiloxane and hexadecyltrimethoxysilane.

[0065] The second component is nano-silica.

[0066] Component three is any one or two or more of sodium carboxylated cellulose, sodium alginate, and carboxylated chitosan;

[0067] The mass ratio of component one, component two, and component three is (0.004–0.006):(35–45):(0.8–1.2).

[0068] In the liquid, the concentration of component three is 4–6 mg / L.

[0069] Beneficial effects

[0070] (1) The aeration pipe provided by the present invention has a protective layer on the surface of the hose, the protective layer including fibers and modifiers, which can effectively improve the mechanical strength and dirt resistance and anti-clogging performance of the hose.

[0071] The modifier layer covering the surface of the fiber layer can effectively protect the hose by utilizing the modifier.

[0072] (2) The aeration tube preparation method provided by the present invention first deposits fibers onto the surface of the hose, and then modifies the surface with a modifying liquid (containing a modifier), which can effectively improve the mechanical strength and dirt resistance and anti-clogging performance of the hose.

[0073] The deposition of fibers can, on the one hand, improve the mechanical strength of the hose, and on the other hand, ensure the adhesion of the modifier and achieve effective fixation of the modifier.

[0074] The modifier can be effectively and stably fixed on the surface of the hose through fibers, thus effectively protecting the hose.

[0075] (3) The aeration tube preparation method provided by the present invention uses a modifier containing a hydrophilic material to modify it, which can effectively adjust the viscosity of the modifier liquid and improve the coating effect of the modifier on the tube surface.

[0076] By controlling the content of hydrophobic and hydrophilic materials, an alternating, composite, multi-layered structure can be formed. The combined action of hydrophobic and hydrophilic materials can prevent the adhesion of organic matter and inhibit the scaling and crystallization of salts and particulate matter, thereby enhancing the anti-fouling and anti-clogging effects. Attached Figure Description

[0077] Figure 1 Image of the semi-coke wastewater used in Example 10;

[0078] Figure 2 Schematic diagram of ventilation test;

[0079] In the diagram: 1. Pressure gauge; 2. Aeration pipe; 3. Air pump; 4. Flow meter; 5. Wastewater. Detailed Implementation

[0080] This disclosure will be more readily understood by referring to the following description, taken in conjunction with the accompanying drawings and examples, all of which form part of this disclosure. It should be understood that this disclosure is not limited to the specific products, methods, conditions, or parameters described and / or illustrated herein. Furthermore, the terminology used herein is for the purpose of describing particular embodiments by way of example only and is not intended to be limiting, unless otherwise stated.

[0081] It should also be understood that, for clarity, certain features of this disclosure may be described herein in the context of individual embodiments, but may also be provided in combination with each other in individual embodiments. That is, unless obviously incompatible or specifically excluded, each individual embodiment is considered to be combinable with any other embodiment, and such combination is considered to represent another different embodiment. Conversely, for brevity, various features of this disclosure described in the context of individual embodiments may also be provided individually or in any sub-combination. Finally, while a particular embodiment may be described as part of a series of steps or part of a more general structure, each step or substructure may also be considered an independent embodiment in itself.

[0082] Unless otherwise stated, it should be understood that each individual element in the list and each combination of individual elements in the list will be interpreted as a different embodiment. For example, a list of embodiments denoted as "A, B, or C" should be interpreted as including embodiments "A", "B", "C", "A or B", "A or C", "B or C", or "A, B, or C".

[0083] In this disclosure, the singular forms of the articles “a,” “an,” and “the” also include the corresponding plural references, and references to a particular value include at least that particular value, unless the context clearly indicates otherwise. Thus, for example, a reference to “substance” is a reference to at least one of such substance and its equivalents.

[0084] Terms including ordinal numbers such as "first" and "second" may be used to describe various components or fluids, but these components and fluids are not limited by these terms. Therefore, without departing from the teachings of this disclosure, these terms are used only to distinguish one component / fluid from another.

[0085] When an item is described using the integrative terms “...and / or ...", the description should be understood to include any of the associated listed items and all combinations thereof; for example, A and / or B should be interpreted as an embodiment that includes “A” but not “B”, an embodiment that includes “B” but not “A”, or an embodiment that includes both “A” and “B”.

[0086] Generally, the use of the term "about" indicates an approximation that can vary depending on the desired characteristics obtained from the disclosed subject matter and will be interpreted in a context-dependent manner based on function. Therefore, those skilled in the art will be able to interpret a degree of difference on a case-by-case basis. In some cases, the number of significant figures used when expressing a particular value can be a representative technique for determining the difference allowed by the term "about." In other cases, a gradient within a range of values ​​can be used to determine the range of differences allowed by the term "about." Furthermore, all ranges in this disclosure are inclusive and composable, and references to values ​​described within a range include every value within that range.

[0087] Throughout the description of this application, when a part is described as "including" a certain element, it does not mean that other elements are excluded, but rather that other elements may be included, unless otherwise expressly stated to the contrary.

[0088] Throughout this specification, when a step is described as being "above" or "before" other steps, this includes not only cases where the step has a direct temporal sequence relationship with the other steps, but also cases where the temporal sequence of two steps changes, such as a mixed step following each step, and where there is an indirect temporal sequence relationship.

[0089] Throughout this specification, the phrase “any embodiment of the first aspect of the first object of the present invention…” does not mean the exclusion of any constituent elements of the described scheme that appear before or after it, but rather means that other constituent elements may also be included, unless otherwise expressly stated to the contrary.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terms used herein and / or include any and all combinations of one or more of the associated listed items.

[0091] Aeration pipe

[0092] The present invention first provides an aeration pipe, wherein the surface of the aeration pipe has a protective layer, the protective layer comprising fibers and a modifier;

[0093] The primary function of the "fiber" as described herein is to enhance the mechanical strength of the hose, and also to help effectively fix the modifier; therefore, the "fiber" may be any one or more of the following: polypropylene fiber, polyurethane fiber, polylactic acid fiber, and polyamide fiber.

[0094] The "modifier" described herein primarily functions to improve the fouling resistance and anti-clogging properties of the hose. Based on this, the modifier may include, for example, any one or two of the following: polydimethylsiloxane, hexadecyltrimethoxysilane, nano silica, sodium carboxylated cellulose, sodium alginate, and carboxylated chitosan.

[0095] Furthermore, the protective layer may selectively satisfy any one or a combination of the following conditions I to:

[0096] Ⅰ) The protective layer includes a fiber layer covering the surface of the hose and a modifier layer covering the surface of the fiber layer;

[0097] (ii) The modifier comprises component one, component two, and component three;

[0098] Component one is any one or two of polydimethylsiloxane and hexadecyltrimethoxysilane.

[0099] The second component is nano-silica.

[0100] The third component is any one or two or more of sodium carboxylated cellulose, sodium alginate, and carboxylated chitosan; preferably, the third component includes sodium carboxylated cellulose.

[0101] (iii) The diameter of the fiber can be any value within any of the following ranges: 10–30 micrometers, 10–25 micrometers, 10–20 micrometers, 10–15 micrometers, 15–30 micrometers, 15–25 micrometers, 15–20 micrometers, 20–30 micrometers, 20–25 micrometers.

[0102] [Preparation method of aeration tube]

[0103] The present invention first provides a method for preparing an aeration tube, comprising the following steps:

[0104] A. Prepare the hose;

[0105] B. Surface modification of the hose;

[0106] C. Drill holes or slits in the hose to obtain the aeration pipe.

[0107] As described in step "A. Prepare hose", it can be any hose that is used in the prior art for aeration pipes.

[0108] As described in step "B. Surface modification of the hose", it specifically includes B1 to B5:

[0109] B1. Deposit fibers onto the surface of the hose.

[0110] The deposition method can be any existing technology, such as "fiber meltblown technology". There are no special requirements for the specific operating conditions of the "fiber meltblown technology", only the amount or thickness E of fiber deposition on the surface of the hose needs to be controlled.

[0111] The "fiber deposition amount (coating amount) on the hose surface" mentioned above can be any value taken from any of the following numerical ranges: 10~55g / m 2 10~50g / m 2 10~45g / m 2 10~40g / m 2 10~35g / m 2 10~30g / m 2 10~25g / m 2 10~20g / m 2 10-15g / m 2 15~55g / m 2 15~50g / m 2 15~45g / m 2 15~40g / m 2 15~35g / m 2 15~30g / m 2 15~25g / m 2 15~20g / m 2 10~55g / m 2 20~55g / m 2 20~50g / m 2 20~45g / m 2 20~40g / m 2 20~35g / m 2 20~30g / m 2 20~25g / m 2 25~55g / m 2 25~50g / m 2 25~45g / m 2 25~40g / m 2 25~35g / m 2 25~30g / m 2 30~55g / m 2 30~50g / m 2 30~45g / m 2 30~40g / m 2 30~35g / m 2 35~55g / m 2 35~50g / m 2 35~45g / m2 35~40g / m 2 40~55g / m 2 40~50g / m 2 40~45g / m 2 45~55g / m 2 50~50g / m 2 45~55g / m 2 Preferably, the amount of fiber sprayed is 10-25 g / m². 2 .

[0112] The "fiber deposition thickness E (spraying thickness E)" mentioned above can be any value taken from any of the following numerical ranges: 0.1-0.7 mm, 0.1-0.5 mm, 0.1-0.3 mm, 0.2-0.7 mm, 0.2-0.5 mm, 0.2-0.3 mm, 0.3-0.7 mm, 0.3-0.5 mm, 0.5-0.7 mm; preferably, the fiber spraying thickness E is 0.2-0.5 mm.

[0113] The "fiber deposition amount (spraying amount)" or "fiber deposition thickness E (spraying thickness E)" mentioned herein aims to ensure the formation of a "fiber layer" on the surface, which effectively covers the surface of the hose. In practice, research has shown that if the spraying amount per unit area is too high, it leads to an increased fiber layer thickness. An excessively thick fiber layer can cause changes in the density between fibers, affecting the strength of the fiber layer itself. If the spraying amount per unit area is too low, a continuous and uniform fiber layer cannot be formed on the hose surface, affecting the fiber layer's mechanical strength; or the fiber layer may be too thin, reducing the amount of modifier adhering to the fiber layer and affecting the hose's dirt resistance and anti-clogging performance.

[0114] Furthermore, it should be noted that when performing fiber spraying, it is best to make the surface of the hose extend. As mentioned here, "extension" means that the surface of the hose is in a relatively stretched state (stretching refers to increasing the surface area of ​​the hose to a certain extent). Based on this, the "fiber" can form a comprehensive and effective coverage effect on the surface of the hose.

[0115] For example, this can be achieved through heating. Based on this, the heating temperature can be any value within any of the following ranges: 45–70℃, 45–65℃, 45–60℃, 45–55℃, 45–50℃, 45–70℃, 50–65℃, 50–60℃, 50–55℃, 55–70℃, 55–65℃, 55–60℃, 60–70℃, 60–65℃; preferably, the heating temperature is 50–55℃. After heating, the surface of the hose is stretched, and then the fiber is sprayed onto the surface of the hose. The purpose is based on the principle of thermal expansion, to improve the flexibility and extensibility of the hose and generate a small surface area; this not only allows the fiber to form a comprehensive and effective coverage on the surface of the hose, but also facilitates the coating effect of the fiber on the surface of the hose.

[0116] B2. Apply pressure to the surface to perform a pressurization treatment.

[0117] As described herein, “after spraying the fiber onto the surface of the hose, the surface is subjected to pressure treatment”, which can effectively enhance the mechanical strength of the hose by the fiber and ensure the modification effect of the modifier.

[0118] However, the amount of pressure applied must be appropriate;

[0119] If the pressure applied during the compression treatment is too low, the fiber will not be able to effectively enhance its mechanical strength. The specific reasons are as follows:

[0120] (a) The fiber layer is easily damaged: After spraying, there are certain gaps between the fibers, and the fibers are not tightly connected. It is necessary to compact the fibers to form a stable fiber layer. If the pressure is too low, the gaps between the fibers will still exist, and the fibers inside the fiber layer will not overlap firmly, so a stable fiber layer cannot be formed, and the fiber layer is easily damaged.

[0121] (b) The fiber layer is prone to detachment: The connection between the fiber layer and the hose requires pressure treatment to strengthen it. If the pressure is too low, the connection between the fibers and between the fibers and the hose will not be firm, which will cause the fiber layer to be damaged and detached.

[0122] (c) The fiber layer cannot play a role in improving mechanical strength: When the connection between the fiber layer and the hose is not firm, the fiber layer cannot effectively share the stress and cannot play a role in strengthening mechanical strength.

[0123] (d) The adhesion effect of the modifier cannot be guaranteed: If the pressure is too low, the fiber layer will be relatively loose. Since the fiber layer is the base for the modifier coating, the amount of modifier loaded and the proportion of each component will change significantly.

[0124] If the pressure applied during the pressurization process is too high, it will reduce the surface roughness of the treated fiber layer, affecting the adhesion and stability of the modifier. Furthermore, excessive pressure will reduce the specific surface area of ​​the fiber layer, resulting in a decrease in the amount of modifier adhering to the fiber layer, thus affecting the aeration pipe's resistance to fouling and clogging.

[0125] Therefore, the pressure applied during the "pressurization process" can be any value within any of the following ranges: 0.5–2 MPa, 0.5–1.5 MPa, 0.5–1 MPa, 1–2 MPa, 1–1.5 MPa, and 1.5–2 MPa. The pressurization method can be rolling. Based on this, the pressurization thickness H1 is set as follows:

[0126] H1 = H0 + E - Δ (Equation 1)

[0127] in,

[0128] H0 is the wall thickness of the hose described in B1.

[0129] E is the deposition thickness of the fiber described in B1.

[0130] Δ is the adjustment amount, ranging from 0.1 to 1 mm.

[0131] The pressurization time can be any value within any of the following ranges: 45-60s, 45-55s, 45-50s, 50-60s, 50-55s, 55-60s.

[0132] Furthermore, it should be noted that in B2, during the pressurization process, it is best to make the surface of the hose appear stretched. As mentioned here, "stretched state" means that the surface of the hose is in a relatively stretched state (stretching refers to increasing the surface area of ​​the hose to a certain extent). Based on this, the "fibers" can form a comprehensive and effective coverage effect on the surface of the hose.

[0133] For example, this can be achieved through heating. Based on this, the heating temperature can be any value within any of the following ranges: 45–70℃, 45–65℃, 45–60℃, 45–55℃, 45–50℃, 45–70℃, 50–65℃, 50–60℃, 50–55℃, 55–70℃, 55–65℃, 55–60℃, 60–70℃, 60–65℃; preferably, the heating temperature is 50–55℃. Heating causes the surface of the hose to extend, which helps the "fibers" to form a comprehensive and effective coverage on the hose surface; it also improves the coating effect of the fibers on the hose surface.

[0134] B3. Make the modified liquid come into contact with the surface treated by B2.

[0135] The “modified liquid” as described herein includes modifiers: component one, component two, and component three;

[0136] Component one is any one or two of polydimethylsiloxane and hexadecyltrimethoxysilane.

[0137] The second component is nano-silica.

[0138] Component three is any one or two or more of sodium carboxylated cellulose, sodium alginate, and carboxylated chitosan;

[0139] The mass ratio of component one, component two, and component three is (0.004–0.006):(35–45):(0.8–1.2).

[0140] In the liquid, the concentration of component three is 4–6 mg / L.

[0141] In B3, when the modified liquid comes into contact with the surface treated in B2, it is best to make the surface of the hose extend, as the term "extension" here means that the surface of the hose is in a relatively stretched state (the stretching refers to the increase in the surface area of ​​the hose to a certain extent). For example, this can be achieved through heating. Based on this, the heating temperature can be any value within any of the following ranges: 45–70℃, 45–65℃, 45–60℃, 45–55℃, 45–50℃, 45–70℃, 50–65℃, 50–60℃, 50–55℃, 55–70℃, 55–65℃, 55–60℃, 60–70℃, 60–65℃; preferably, the heating temperature is 50–55℃. After heating, the surface of the hose is stretched, allowing the "modifier" to form a comprehensive and effective coverage on the fiber layer surface; it also facilitates the coating effect of the modifier on the fiber layer surface, promoting connection / reaction at the interface during the coating process.

[0142] At this point, if the heating temperature is too high, it will cause changes in the strength of the hose itself and will also be detrimental to the uniformity and stability of the modifier coating; if the heating temperature is too low, it will be detrimental to the maintenance of the modifier state, and may cause flocculation and sedimentation of substances, and will also be detrimental to the connection / reaction rate at the interface.

[0143] B4. Apply pressure to the surface treated by B3.

[0144] As described herein, "pressure treatment of the surface after B3 treatment (completion of modifier application)" can effectively improve the adhesion stability of the modifier on the hose surface and enhance the stability of the formed "modifier layer".

[0145] However, the amount of pressure applied must be appropriate;

[0146] If the pressure applied during pressurization is too low, it will result in:

[0147] (a) The modified coating after treatment is loose and cannot form a continuous and tight protective layer. It is easily disturbed and damaged, and thus fails.

[0148] (b) The treated modifier coating cannot fully contact and adsorb onto the fiber layer.

[0149] If the pressure intensity during the pressurization process is too high, the modified agent will be excessively compressed and diffused after treatment. This will reduce the amount of modified agent adsorbed per unit area in the fiber layer, resulting in an insufficiently continuous and compact modified agent layer that cannot fully exert its function.

[0150] Therefore, the pressure applied during the "pressurization process" can be any value taken from any of the following sets of numerical values:

[0151] 0.5~2MPa, 0.5~1.5MPa, 0.5~1MPa, 1~2MPa, 1~1.5MPa, 1.5~2MPa. The pressurization method can...

[0152] Therefore, rolling is performed, and during the pressurization process described above,

[0153] The pressure thickness H3 is set as follows:

[0154] H3 = H2 - Δ (Equation 2)

[0155] in,

[0156] H2 is the wall thickness of the hose after the B2 treatment is completed;

[0157] Δ is the adjustment amount, ranging from 0.1 to 1 mm.

[0158] The pressurization time can be any value within any of the following ranges: 45-60s, 45-55s, 45-50s, 50-60s, 50-55s, 55-60s.

[0159] Furthermore, it should be noted that in B4., during the pressurization process, it is best to make the surface of the hose appear stretched. As mentioned here, "stretched state" means that the surface of the hose is in a relatively stretched state (stretching refers to increasing the surface area of ​​the hose to a certain extent). Based on this, the "fibers" can form a comprehensive and effective coverage effect on the surface of the hose.

[0160] For example, this can be achieved through heating. Based on this, the heating temperature can be any value within any of the following ranges: 45–70℃, 45–65℃, 45–60℃, 45–55℃, 45–50℃, 45–70℃, 50–65℃, 50–60℃, 50–55℃, 55–70℃, 55–65℃, 55–60℃, 60–70℃, 60–65℃; preferably, the heating temperature is 50–55℃. Heating causes the surface of the hose to extend, which helps the "modifier" to form a comprehensive and effective coverage on the hose surface; it also improves the coating effect of the modifier on the hose surface.

[0161] B5. Dry the surface after B4 treatment.

[0162] The drying temperature shall not exceed 85°C, preferably not exceed 70°C;

[0163] In the aeration tube preparation method provided above, steps B3. to B5. can be repeated N times, where N is an integer ≥ 1; preferably, N is an integer from 2 to 5. During the modification of the hose surface using the modifier, the "contact"-"pressurization"-"drying" process can be repeated multiple times, ultimately forming a multi-layered "modifier coating layer" on the hose surface, effectively and persistently maintaining the modifier's effect on the hose surface.

[0164] To demonstrate the technical solutions and advantages of the present invention, the technical solutions in the embodiments of the present invention will be fully described below. The following embodiments:

[0165] 1. The selected hose is a 100% polyurethane hose in a good condition without any holes or cuts. It has a diameter of 50mm, a wall thickness of 2mm, and uniform material. There is no inner or outer lining made of other materials.

[0166] 2. Selected fiber: polypropylene fiber with a diameter of 20 micrometers.

[0167] 3. The modifiers used contain polydimethylsiloxane (PDMS), nano-silica (SiO2, particle size 10nm), and sodium carboxylated cellulose (CMC);

[0168] Preparation of the modified solution: The solvent used is a 5% aqueous ethanol solution; Specific steps:

[0169] (1) Add CMC powder to the solvent to achieve a mass concentration of 5 mg / L. Stir for 5 min, sonicate for 15 min, and then let stand for 24 hours.

[0170] (2) Add PDMS to achieve a mass concentration of 4wt%, stir for 10min, and sonicate for 30min to obtain PDMS emulsion.

[0171] (3) Add SiO2 to achieve a mass concentration of 1 g / L. Stir for 20 min and sonicate for 60 min.

[0172] (4) Stir and heat the solution until the temperature reaches 50-55℃ before use.

[0173] Example 1

[0174] 1. Surface modification of hoses:

[0175] Step 1: Using a meltblown process, polypropylene fibers are deposited onto the surface of the hose.

[0176] The polypropylene fiber melt-blowing operation:

[0177] (1) The thickness of the polypropylene fiber formed by meltblowing is between 0.2-0.3 mm, and the thickness is relatively uniform in all places.

[0178] (2) Polypropylene fiber spraying amount is 10g / m 2 The amount of coating applied is relatively uniform throughout the area.

[0179] (3) The meltblown outlet temperature is 190℃.

[0180] (4) Before meltblowing, the hose is preheated to 50°C.

[0181] (5) During meltblowing, the hose is wrapped around the support and is in an unfolded state rather than a flattened state.

[0182] (6) After melt-blowing, the hose is rolled. The rolling thickness is set as follows:

[0183] H1=H0+E-Δ

[0184] Where H1 is the set thickness for rolling after meltblowing; H0 is the wall thickness of the hose; E is the designed thickness of the meltblown polypropylene layer; Δ is the rolling adjustment amount, which is 0.8 mm and is determined by the production pilot test.

[0185] (7) During the rolling process, the hose is wrapped around the support and is in an unfolded state rather than a flattened state.

[0186] (8) During the rolling process, the hose temperature is 50°C.

[0187] (9) The rolling process involves rolling each meter of hose for 60 seconds.

[0188] (10) After the rolling process, the substrate spraying step is completed.

[0189] Step 2: Modify the surface using a modifier;

[0190] (1) Preheat the hose to 50°C.

[0191] (2) Immerse the hose completely in the modifier, ensuring that the outer surface of the hose is in full contact with the modifier, while the inner surface does not need to be in contact with the modifier. The dwell time is 3 minutes. During this time, continuously stir the modifier.

[0192] (3) When soaking, the hose is wrapped around the support and is in an unfolded state rather than a flattened state.

[0193] (4) Remove the hose from the modifier and then perform a rolling process. The rolling thickness is set as follows:

[0194] H3=H2-Δ

[0195] Where H3 is the set thickness after soaking and rolling; H1 is equal to H1 in the aforementioned formula 1; Δ is the rolling adjustment amount, which is 1 mm and is determined by the production trial.

[0196] (5) During the rolling process, the hose is wrapped around the support and is in an unfolded state rather than a flattened state.

[0197] (6) After rolling, dry the hose in a forced-air dryer at 70°C for 120 minutes.

[0198] (7) During the drying process, the hose is wrapped around the support and is in an unfolded state rather than a flattened state.

[0199] (8) After drying, soak. Repeat the soaking, rolling and drying process three times.

[0200] (9) The surface modification of the hose is complete.

[0201] 2. Preparation of aeration pipe: According to the required specifications and models, the hose is perforated or slit to form an aeration pipe.

[0202] Example 2-1

[0203] This embodiment is basically the same as embodiment 1, except that in "step one", cotton and linen are deposited on the surface of the hose.

[0204] Example 2-2

[0205] This embodiment is basically the same as Embodiment 1, except that in "Step 1", a gel-like viscous base hydrogel is used instead of fibers.

[0206] Example 3-1

[0207] This embodiment is basically the same as Embodiment 1, except that: in the process of "Step 1, using meltblown operation to deposit polypropylene fibers onto the surface of the hose;", no rolling operation is performed.

[0208] Example 3-2

[0209] This embodiment is basically the same as embodiment 1, except that in step (6) of the process of “step one, using meltblown operation to deposit polypropylene fibers onto the surface of the hose;”, after meltblown operation, the hose is rolled. In the rolling thickness setting, the rolling adjustment amount Δ is set to 1.5mm, which is outside the range of 0.1 to 1mm.

[0210] Example 4

[0211] This embodiment is basically the same as Embodiment 1, except that: in the process of "Step 2, modifying the surface with a modifier;", rolling is not performed.

[0212] Example 5

[0213] This embodiment is basically the same as Embodiment 1, except that: in the process of "Step 1, using meltblown operation to deposit polypropylene fibers onto the surface of the hose;", no rolling operation is performed.

[0214] Meanwhile, in the process of "step two, modifying the surface with a modifier;", no rolling operation is performed.

[0215] Example 6

[0216] This embodiment is basically the same as embodiment 1, except that: in the process of “step two, modifying the surface with a modifier;” step (2) is: immerse the aeration hose completely in the modifier so that its outer surface is in complete contact with the aeration hose and its inner surface is not in contact with the modifier, and stay for 20 minutes, during which the modifier is continuously stirred.

[0217] Meanwhile, in step (8), the surface modification of the hose is completed after soaking, rolling and drying are carried out in sequence.

[0218] Example 7

[0219] This embodiment is basically the same as embodiment 1, except that: in the process of “step one, using meltblown operation to deposit polypropylene fibers onto the surface of the hose;” step (4) is: before meltblown operation, there is no need to preheat the hose.

[0220] Example 8

[0221] This embodiment is basically the same as embodiment 1, except that step (1) in the process of “step two, modifying the surface with a modifier” is also cancelled, that is, there is no need to preheat the hose before contacting the modifier.

[0222] Example 9

[0223] This embodiment is basically the same as embodiment 1, except that: in the process of “step one, using meltblown operation to deposit polypropylene fibers onto the surface of the hose;” step (4) is: before meltblown operation, there is no need to preheat the hose.

[0224] At the same time, step (1) in the process of “step two, modifying the surface with a modifier;” is also cancelled, that is, there is no need to preheat the hose before contacting the modifier.

[0225] Example 10

[0226] This embodiment verifies the modified hoses obtained in Examples 1 to 9 by preparing aeration hoses of the same model.

[0227] 1. Strength performance verification:

[0228] Tensile Test: Tensile strength was determined according to GB / T528-2009 using a WDM-10M tensile testing machine. The pipe was cut into dumbbell shapes using a punching machine and a dumbbell-shaped cutter, producing two specimens; one specimen was used. The thickness of the dumbbell-shaped specimen was measured at the middle and both ends using a thickness gauge, and the average value was used to set the thickness value for the tensile testing machine. The specimen was symmetrically clamped onto the upper and lower grips of the tensile testing machine, and the gauge length was set. The tensile test was conducted at a gripping speed of 500 mm / min. The pipe strength was rated based on the test results.

[0229] Grade A: Low strength, tensile strength range: 10-15 MPa;

[0230] Grade B: Medium strength, tensile strength range: 16-20 MPa;

[0231] Grade C: Medium to high strength, tensile strength range: 21-25 MPa;

[0232] Grade D: High strength, tensile strength range: 26-30 MPa;

[0233] Grade E: Extremely high strength, tensile strength range: 31-35 MPa.

[0234] 2. Stain resistance verification:

[0235] Static Settling Test: The sample was placed in a type of semi-coke wastewater to assess the surface fouling. Semi-coke wastewater is a complex and highly hazardous industrial wastewater containing oils, recalcitrant organic matter, and large amounts of inorganic salts, which severely clogs aeration pipes. Using semi-coke wastewater allows for testing the pipes' fouling resistance under extremely adverse environments. Water quality conditions are shown in Table 1 below. Figure 1 As shown.

[0236] Table 1 Water Quality Indicators

[0237] 1 Oil (mg / L) 200 2 Total phenols (mg / L) 9000 3 Volatile phenols (mg / L) 5500 4 Total nitrogen (mg / L) 4000 5 Ammonia nitrogen (mg / L) 3000 6 CODcr (mg / L) 20000 8 SS (mg / L) 100 9 Dissolved solids (mg / L) 2000 10 pH value 9.1～9.8 11 chromaticity 400 times

[0238] In the experiment, a 1-meter-long pipe sample was completely submerged in semi-coke wastewater. After soaking for 24 hours, the sample was removed and its surface condition was observed. The degree of pollution was rated based on the observation results.

[0239] Grade A: No visible contamination. Description: There are no obviously visible stains or discoloration on the surface of the hose.

[0240] Grade B: Slight contamination. Description: There are slight stains or discoloration on the surface of the hose, but it does not significantly affect the overall appearance.

[0241] Grade C: Moderate contamination. Description: The hose surface has obvious stains or discoloration, which may cause localized color changes or fading.

[0242] Grade D: Severe contamination. Description: The hose surface is significantly contaminated, with possible large areas of discoloration, spots, or deposits.

[0243] Grade E: Extremely severe contamination. Description: The hose surface is severely contaminated, and there may be significant deposits, deterioration, or damage.

[0244] 3. Anti-clogging performance verification:

[0245] Ventilation test: such as Figure 2 As shown, a 2m sample was completely submerged in the sewage described in Table 1 to a depth of 1.5m, with a 1m... 3 Aeration was carried out at a flow rate of / h for 24 hours. Changes in aeration pressure were recorded. This method, along with a fouling resistance test on semi-coke wastewater, can test the anti-clogging performance of aeration hoses under extremely adverse conditions.

[0246] The anti-clogging performance of the sample is evaluated based on the ratio of the pressure difference at the beginning and end of the ventilation to the pressure value at the beginning of ventilation, as shown in Equation 3.

[0247]

[0248] Where P t P1 is the pressure reading at the end of ventilation, and P2 is the pressure reading at the beginning of ventilation. The anti-clogging performance of the sample is rated based on this ratio.

[0249] Grade A: Ventilation pressure difference less than 20%. Description: During the ventilation process, the ventilation pressure changes very little, achieving a good anti-clogging effect.

[0250] Grade B: Ventilation pressure difference is between 20% and 40%. Description: During ventilation, the ventilation pressure changes little, demonstrating good anti-clogging performance.

[0251] Grade C: Ventilation pressure difference is between 40% and 60%. Description: During ventilation, the ventilation pressure changes moderately, and the anti-clogging performance is average.

[0252] Level D: Ventilation pressure difference is between 60% and 90%. Description: During ventilation, the ventilation pressure changes significantly, posing a certain risk of blockage.

[0253] Level E: Ventilation pressure difference greater than 90%, Description: During ventilation, the ventilation pressure changes significantly and rapidly, indicating severe blockage.

[0254] Table 2 shows the strength, stain resistance, and anti-clogging performance as follows:

[0255] 1 C B A 2-1 B D C 2-2 A C D 3-1 A C D 3-2 C D D 4 C C B 5 C D C 6 C C C 7 A C C 8 C C C 9 A D D

[0256] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an aeration tube, characterized in that, Includes the following steps: A. Prepare the hose; B. Surface modification of the hose; C. Drill holes or slits in the hose to obtain the aeration pipe; Wherein, B includes: B1. Deposit fibers onto the surface of the hose; B2. Apply pressure to the surface to perform a pressurization treatment; B3. Bring the modified liquid containing the modifier into contact with the surface treated by B2; The modifiers used contain polydimethylsiloxane, nano-silica, and sodium carboxylated cellulose; The modified solution was prepared using a 5% aqueous ethanol solution as the solvent. Sodium carboxylated cellulose was added to achieve a mass concentration of 5 mg / L; polydimethylsiloxane was added to achieve a mass concentration of 4 wt%; and nano-silica was added to achieve a mass concentration of 1 g / L. B4. Apply pressure to the surface treated in B3; B5. The surface treated in B4 is dried, and the drying temperature does not exceed 85°C; Steps B3 to B5 are repeated N times, where N is an integer ≥ 1.

2. The method for preparing the aeration tube according to claim 1, characterized in that, The B1 includes: First, the hose is heated to a temperature of 45-70°C. Then, the fibers are sprayed onto the surface of the hose.

3. The method for preparing the aeration tube according to claim 1 or 2, characterized in that, In B1, the coating thickness E of the fiber is 0.1~0.7mm.

4. The method for preparing the aeration tube according to claim 3, characterized in that, In B2, during the pressurization process, the pressurization thickness H1 is set as follows: 1 (Equation 1) in, H0 is the wall thickness of the hose described in B1. E is the deposition thickness of the fiber described in B1. Δ1 is the adjustment amount, ranging from 0.1 to 1 mm; And / or, In B4, during the pressurization process, the pressurization thickness H3 is set as follows: 2 (Equation 2) in, H2 is the wall thickness of the hose after the B2 treatment is completed; Δ2 is the adjustment amount, ranging from 0.1 to 1 mm.

5. The method for preparing the aeration tube according to claim 4, characterized in that, In B1, the surface is in an extended state during fiber spraying; and / or, In B2, during the pressurization process, the surface is in an extended state; and / or, In B3, during contact, the surface is in an extended state; and / or, In B4, the surface is in an extended state during the pressurization process.

6. The method for preparing the aeration tube according to any one of claims 4 to 5, characterized in that, In step B3, during contact, the temperature of the modified liquid is maintained at 45~70℃.

7. The method for preparing the aeration tube according to any one of claims 2, 4 to 5, characterized in that, N is an integer from 2 to 5.

8. An aeration tube prepared by the method according to any one of claims 1 to 7, characterized in that, The aeration pipe includes: hose; A protective layer located on the surface of the hose; The protective layer includes fibers and a modifier; The protective layer includes a fiber layer covering the surface of the hose and a modifier layer covering the surface of the fiber layer.

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