Corrosion-resistant film shell structure and manufacturing method

Abstract

The invention discloses a corrosion-resistant membrane shell structure and a manufacturing method, relates to the technical field of separation membrane shells, and solves the problem that an existing lining cannot bear the working environment of a highly corrosive medium. The method comprises the following steps: selecting a heat-shrinkable plastic film as a film shell lining layer, heating to shrink the plastic film on the surface of a mold, manufacturing a film shell main body structure outside the plastic film, and curing the film shell main body structure; and meanwhile, corrosion protection treatment is carried out on the open holes in the membrane shell main body structure and the membrane shell main body structure exposed out of the mounting planes of the raw water port and the concentrated water port. A composite structure is adopted, and the composite structure is composed of a plastic lining and a glass fiber reinforced plastic body structure. When the membrane shell is used, the membrane shell is filled with a working medium, and the glass fiber reinforced plastic part can be separated from the working medium through the plastic lining; the corrosion resistance of the plastic lining is far higher than that of glass fiber reinforced plastic, so that the membrane shell with the lining can be used under various strong corrosive medium conditions, and the corrosion damage of a product is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of separation membrane shells, in particular to a corrosion-resistant membrane shell structure and a manufacturing method thereof. Background Art

[0002] The separation membrane housing is a crucial component of membrane elements in membrane water treatment projects and a core component of the separation membrane system, providing stable support and an operating environment for the separation membrane. It is made using a winding process with glass fiber and its products as reinforcement materials, epoxy resin as the matrix. Currently, the inner layer of the FRP membrane housing primarily utilizes resin-impregnated organic fiber felt to create a pipe lining, forming a resin-rich layer that not only prevents leakage but also provides a certain degree of corrosion resistance. However, as the application areas of FRP membrane housings expand, membrane housings often come into contact with highly corrosive media. Traditional lining technology cannot withstand the working environment of highly corrosive media, and corrosion of the lining can lead to leakage. Summary of the Invention

[0003] To address the aforementioned issue of existing liners being unable to withstand highly corrosive working environments, this invention proposes a corrosion-resistant membrane shell structure and manufacturing method. This invention utilizes a composite structure consisting of a plastic liner and a fiberglass reinforced plastic (FRP) main structure. The plastic liner isolates the FRP portion from the working medium, preventing corrosion damage to the product.

[0004] The present invention proposes a method for manufacturing a corrosion-resistant membrane housing, comprising the following steps:

[0005] Step 1: Mold preparation: Cool the mold of the membrane shell to below 40°C, clean the mold, and apply or spray a release agent;

[0006] Step 2: Lining material selection: Select the appropriate heat shrinkable plastic film size according to the mold size; select the appropriate plastic film softening and melting temperature according to the curing system of the resin formula selected to make the main structure of the membrane shell; select the material of the plastic film according to the actual application conditions of the final product;

[0007] Step 3: Prepare the inner lining layer: Cover the mold with the selected plastic film, heat the mold, and control the mold surface temperature to be 10-15°C higher than the thermal shrinkage temperature or softening temperature of the plastic film, and lower than the melting temperature of the plastic film. Continue heating until the plastic film shrinks or softens and adheres tightly to the mold surface.

[0008] Step 4: Composite interface treatment: evenly apply surface treatment agent on the surface of the plastic film to improve the inert surface of the plastic material;

[0009] Step 5: Making the main structure: Making the main structure of the membrane shell outside the plastic film and curing it;

[0010] Step 6. Structural protection: Carry out corrosion protection treatment on the openings on the main structure of the membrane shell and the exposed membrane shell main structure at the installation plane of the raw water inlet and the concentrated water inlet.

[0011] Furthermore, the thickness h of the plastic film after heat shrinkage in step 2 is in the range of 0.2mm≤h≤2mm, the shrinkage temperature is ≥70°C, the melting temperature is ≥185°C, the surface roughness is ≤0.8μm, the radial shrinkage rate is ≥10%, the axial shrinkage rate is ≤10%, and the elongation at break is ≥10%.

[0012] Furthermore, in step 2, the plastic film is in a cylindrical shape, and the circumference L of the cylinder satisfies:

[0013] L0·(1+a)≥L≥L0·1.1

[0014] Where L0 is the circumference of the mold and a is the radial shrinkage rate of the plastic film.

[0015] Furthermore, in step 2, the softening temperature of the plastic film T1≤T min , T min The lowest curing temperature in the formula curing system; the melting temperature of the plastic film T2 ≥ T max , T max It is the highest curing temperature in the formula curing system.

[0016] Furthermore, in step 3, the coverage area S of the plastic film on the mold satisfies:

[0017] S≥S0 / (1-b)

[0018] Where S0 is the area of ​​the product to be produced, and b is the axial shrinkage rate of the plastic film.

[0019] Furthermore, in step six, a plastic film is covered on the exposed position of the main structure of the membrane shell, and overlapped with the plastic film at the inner lining layer, with an overlap length of 5mm-10mm; the plastic film at the exposed position is heated to soften it, and pressure is applied to the softened plastic film through tooling to connect it with the plastic film at the inner lining layer.

[0020] Furthermore, in step six, a plastic film is covered on the exposed membrane shell main structure, and the plastic film is selected to be the same material as the lining layer; the plastic film and the lining layer are overlapped, and the overlap length is 5-10mm; a plastic welding gun and a plastic welding rod are used to perform heat welding on the overlapped seams.

[0021] Furthermore, in step six, the same material as the lining layer is selected, melted into liquid, and then evenly coated on the exposed main structure of the membrane shell. After it cools and hardens, the surface is polished.

[0022] Furthermore, in step six, a corrosion-resistant coating is sprayed on the exposed main structure of the membrane housing or a sealing ring is installed.

[0023] A corrosion-resistant membrane shell structure manufactured by the above-mentioned corrosion-resistant membrane shell manufacturing method specifically includes a membrane shell main structure, an inner lining layer is arranged on the inner side of the membrane shell main structure, and the inner lining layer is made of corrosion-resistant material.

[0024] The corrosion-resistant membrane housing structure and manufacturing method of the present invention have the following beneficial effects:

[0025] (1) The corrosion-resistant membrane housing structure and manufacturing method described in the present invention utilize a composite structure consisting of a plastic lining and a fiberglass reinforced plastic (FRP) main structure. During use, the membrane housing is filled with a working medium, and the plastic lining isolates the FRP portion from the working medium. Because the plastic lining has much higher corrosion resistance than FRP, the membrane housing equipped with this lining can be used in various highly corrosive media conditions, preventing corrosion damage to the product.

[0026] (2) The corrosion-resistant membrane shell structure and manufacturing method described in the present invention preferably covers a layer of plastic lining on the mold, and after interface treatment, the membrane shell main body fiberglass structure is manufactured on the plastic lining. Since the softening temperature of the selected plastic lining is lower than the lowest curing temperature during the curing process of the membrane shell, the plastic lining will soften when the membrane shell is cured. At this time, the outer fiberglass main structure will be physically embedded with the plastic lining under the action of tension, and during the curing process, the matrix resin in the fiberglass will also adhere to the surface of the plastic lining treated with the treatment agent to achieve chemical connection. Therefore, after the curing is completed, the plastic lining can be firmly combined with the fiberglass main structure of the membrane shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] In the attached figure:

[0029] Figure 1 This is a schematic diagram of the composite structure of a corrosion-resistant membrane shell structure and the exposed portion of the fiberglass reinforced plastic structure according to the present invention;

[0030] Figure 2 This is a schematic diagram of hot pressing of an exposed area of ​​a corrosion-resistant membrane shell structure according to the present invention;

[0031] Among them: 1-membrane shell main structure, 2-inner lining, 3-exposed area, 4-hot pressing tooling, 5-overlap area, 6-plastic film hot pressing area. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Specific implementation method 1: See Figure 1-Figure 2 The present embodiment is described in detail. A method for manufacturing a corrosion-resistant membrane housing according to the present embodiment comprises the following steps:

[0037] Step 1: Mold preparation: Cool the mold of the membrane shell to below 40°C, clean all impurities and dirt from the mold surface, make the mold surface smooth and free of bumps, and apply or spray a release agent;

[0038] Step 2: Lining material screening: The lining material is made of plastic, specifically a soft heat-shrinkable plastic film. The applicable heat-shrinkable plastic film has a thickness h range of 0.2mm≤h≤2mm after heat shrinkage, a shrinkage temperature ≥70℃, a melting temperature ≥185℃, a surface roughness ≤0.8μm, a radial shrinkage rate ≥10%, an axial shrinkage rate ≤10%, and an elongation at break ≥10%;

[0039] Select the appropriate heat shrinkable plastic film size according to the mold size; the plastic film is cylindrical in shape, and the circumference L of the cylinder satisfies:

[0040] L0·(1+a)≥L≥L0·1.1

[0041] Where L0 is the circumference of the mold, a is the radial shrinkage rate of the plastic film;

[0042] The appropriate softening and melting temperatures of the plastic film are selected according to the curing system of the resin formula selected to make the membrane shell main structure 1. Specifically, the following temperature relationship must be met:

[0043] Plastic film softening temperature T1≤T min , T min The lowest curing temperature in the formula curing system; the melting temperature of the plastic film T2 ≥ T max , T max The maximum curing temperature in the formula curing system

[0044] The material of the plastic film should be selected according to the actual application conditions of the final product. When the product is used in a strong alkaline environment, PP, PE, PTFE or PVDF should be selected; when the product is used in a strong oxidizing environment, PTFE, PVDF or PVC should be selected.

[0045] Material selection for the main structure of the membrane shell 1: The main structural material is the reinforcing fiber and resin matrix used when the FRP membrane shell is made by winding, hand lay-up, molding and other processes. There is no restriction on the main structural material, and various FRP molding materials can be used, including glass fiber, basalt fiber, carbon fiber and other reinforcing materials, as well as various resin matrices such as epoxy resin, polyurethane resin, vinyl resin, unsaturated resin, etc.

[0046] Step 3: Prepare the inner lining layer 2: Cover the mold with the selected plastic film. The covering area S of the plastic film on the mold satisfies:

[0047] S≥S0 / (1-b)

[0048] Where S0 is the area of ​​the product to be produced, b is the axial shrinkage rate of the plastic film;

[0049] Heat the mold and control the mold surface temperature T s The temperature is 10-15°C higher than the shrinkage temperature or softening temperature of the plastic film, and lower than the melting temperature of the plastic film. Continue heating until the plastic film shrinks or softens and adheres to the mold surface.

[0050] Step 4: Composite interface treatment: According to the material of the plastic film, select a plastic surface treatment agent suitable for this material; evenly apply the surface treatment agent on the surface of the plastic film to improve the inert surface of the plastic material, so that it is closely combined with the outer main structure and improve the interface performance;

[0051] Step 5: Make the main structure: Use winding, hand lay-up, molding and other processes to make the membrane shell main structure 1 directly on the outside of the plastic film and complete the curing;

[0052] Step 6: Structural protection: After the membrane shell is cured and demoulded, holes may be opened on the main structure according to actual needs. At the same time, in order to install the original concentrated water outlet, it is necessary to process the installation surface at the opening. This will cause the local lining to be damaged, exposing the fiberglass. Figure 1 As shown. Once these exposed parts come into contact with highly corrosive media, they will still suffer corrosion damage, so special local protection is required;

[0053] Cover the exposed part of the membrane shell main structure 1 with plastic film. The plastic film needs to completely cover the exposed area 3 and overlap with the inner lining layer 2 of the membrane shell main structure 1 with an overlap length of 5-10mm. Use a hot air blower or other heating method to evenly heat the plastic film. Control the heating temperature to be 10-15℃ higher than the softening temperature of the plastic film. After the plastic film softens, use a hot pressing tool 4 that fits the shape of the area to apply a uniform pressure to the plastic film, such as Figure 2 As shown, the temperature is then lowered to harden the plastic film, and the plastic film is then thermally pressed together.

[0054] This embodiment also provides a corrosion-resistant membrane shell structure manufactured using the above-mentioned corrosion-resistant membrane shell manufacturing method, including a membrane shell main structure 1, an inner lining layer 2 is provided on the inner side of the membrane shell main structure 1, and the inner lining layer 2 is made of corrosion-resistant material; the openings on the membrane shell main structure 1 and the installation plane of the original concentrated water outlet are treated with corrosion protection by hot pressing a plastic film on the exposed area 3.

[0055] Specific implementation method 2: See Figure 1 Specific description of this embodiment. This embodiment describes a method for manufacturing a corrosion-resistant membrane shell, step six structural protection: after the membrane shell is cured and demoulded, according to actual needs, a hole may be opened on the main structure. At the same time, in order to install the original concentrated water outlet, it is necessary to process the installation plane at the opening. This will cause the local lining to be damaged, exposing the fiberglass reinforced plastic, such as Figure 1 As shown. Once these exposed parts come into contact with highly corrosive media, they will still suffer corrosion damage, so special local protection is required;

[0056] Cover the exposed area 3 of the membrane housing main structure 1 with a plastic film made of the same material as the inner lining 2. The plastic film should completely cover the exposed fiberglass reinforced plastic and overlap the inner lining 2 by 5-10 mm. Heat weld the overlapping seam using a plastic welding gun and a plastic welding rod made of the same material as the inner lining 2. The remaining steps of the corrosion-resistant membrane housing fabrication method described in this embodiment are the same as those in the first embodiment.

[0057] This embodiment also provides a corrosion-resistant membrane shell structure manufactured using the above-mentioned corrosion-resistant membrane shell manufacturing method, including a membrane shell main structure 1, an inner lining layer 2 is provided on the inner side of the membrane shell main structure 1, and the inner lining layer 2 is made of corrosion-resistant material; the openings on the membrane shell main structure 1 and the installation plane of the original concentrated water outlet are treated with corrosion protection for the exposed areas 3 by welding the plastic film and the inner lining layer 2 together.

[0058] Specific implementation method three: see Figure 1 Specific description of this embodiment. This embodiment describes a method for manufacturing a corrosion-resistant membrane shell, step six structural protection: after the membrane shell is cured and demoulded, according to actual needs, a hole may be opened on the main structure. At the same time, in order to install the original concentrated water outlet, it is necessary to process the installation plane at the opening. This will cause the local lining to be damaged, exposing the fiberglass reinforced plastic, such as Figure 1 As shown. Once these exposed parts come into contact with highly corrosive media, they will still suffer corrosion damage, so special local protection is required;

[0059] The same material as the inner lining 2 is selected and melted into a liquid state, and then evenly applied to the exposed area 3. After it cools and hardens, the surface is polished to make it smooth. The other steps of the method for making the corrosion-resistant membrane shell described in this embodiment are the same as those in the first embodiment.

[0060] This embodiment also provides a corrosion-resistant membrane shell structure manufactured using the above-mentioned corrosion-resistant membrane shell manufacturing method, including a membrane shell main structure 1, an inner lining layer 2 is provided on the inner side of the membrane shell main structure 1, and the inner lining layer 2 is made of corrosion-resistant material; the openings on the membrane shell main structure 1 and the installation plane of the original concentrated water outlet are treated with corrosion protection by melting the material into a liquid and applying it to the exposed area 3.

[0061] Specific implementation method four: see Figure 1 Specific description of this embodiment. This embodiment describes a method for manufacturing a corrosion-resistant membrane shell, step six structural protection: after the membrane shell is cured and demoulded, according to actual needs, a hole may be opened on the main structure. At the same time, in order to install the original concentrated water outlet, it is necessary to process the installation plane at the opening. This will cause the local lining to be damaged, exposing the fiberglass reinforced plastic, such as Figure 1As shown. Once these exposed parts come into contact with highly corrosive media, they will still suffer corrosion damage, so special local protection is required;

[0062] The exposed area 3 of the membrane housing main structure 1 is sprayed with a corrosion-resistant coating, such as a PTFE Teflon coating, to provide corrosion protection there. The other steps of the corrosion-resistant membrane housing manufacturing method described in this embodiment are the same as those in the first embodiment.

[0063] This embodiment also provides a corrosion-resistant membrane shell structure manufactured using the above-mentioned corrosion-resistant membrane shell manufacturing method, including a membrane shell main structure 1, an inner lining layer 2 is provided on the inner side of the membrane shell main structure 1, and the inner lining layer 2 is made of corrosion-resistant material; the openings on the membrane shell main structure 1 and the installation plane of the original concentrated water outlet are treated with corrosion-resistant coating on the exposed areas 3.

[0064] Specific implementation method five: see Figure 1 Specific description of this embodiment. This embodiment describes a method for manufacturing a corrosion-resistant membrane shell, step six structural protection: after the membrane shell is cured and demoulded, according to actual needs, a hole may be opened on the main structure. At the same time, in order to install the original concentrated water outlet, it is necessary to process the installation plane at the opening. This will cause the local lining to be damaged, exposing the fiberglass reinforced plastic, such as Figure 1 As shown. Once these exposed parts come into contact with highly corrosive media, they will still suffer corrosion damage, so special local protection is required;

[0065] A sealing ring is installed at the exposed area 3 of the membrane housing main structure 1. The sealing ring can completely cover the exposed fiberglass, preventing corrosive media from contacting the exposed fiberglass, thereby achieving a protective effect. The other steps of the corrosion-resistant membrane housing manufacturing method described in this embodiment are the same as those in the first embodiment.

[0066] This embodiment also provides a corrosion-resistant membrane shell structure manufactured using the above-mentioned corrosion-resistant membrane shell manufacturing method, including a membrane shell main structure 1, an inner lining layer 2 is provided on the inner side of the membrane shell main structure 1, and the inner lining layer 2 is made of corrosion-resistant material; the openings on the membrane shell main structure 1 and the installation plane of the original concentrated water outlet are subjected to corrosion-resistant treatment on the exposed area 3 by installing a sealing ring.

[0067] To summarize the above-mentioned examples, the corrosion-resistant membrane housing structure and manufacturing method described herein utilize a composite structure consisting of a plastic liner and a fiberglass reinforced plastic (FRP) main structure. During use, the membrane housing is filled with a working medium, and the plastic liner isolates the FRP portion from the working medium. Because the plastic liner has far superior corrosion resistance to FRP, the membrane housing equipped with this liner can be used in a variety of highly corrosive media, preventing corrosion damage to the product. In the corrosion-resistant membrane housing structure and manufacturing method described herein, a plastic liner is first applied to the mold. After interface treatment, the FRP main structure of the membrane housing is fabricated on the plastic liner. Because the softening temperature of the selected plastic liner is lower than the minimum curing temperature during the curing process of the membrane housing, the plastic liner softens during curing. At this point, the outer FRP main structure, under tension, physically interlocks with the plastic liner. During the curing process, the matrix resin in the FRP also adheres to the surface of the plastic liner, which has been treated with a treatment agent, forming a chemical bond. Therefore, after curing, the plastic liner is securely bonded to the FRP main structure of the membrane housing.

[0068] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the invention. Reasonable combinations of the features described in the above embodiments are also possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A method for manufacturing a corrosion-resistant membrane housing, characterized in that: The following steps are involved: Step 1: Mold preparation: Cool the mold of the membrane shell to below 40°C, clean the mold, and apply or spray a release agent; Step 2, lining material selection: select the appropriate heat shrinkable plastic film size according to the mold size; select the appropriate plastic film softening and melting temperature according to the curing system of the resin formula selected to make the main structure of the membrane shell (1); select the material of the plastic film according to the actual application conditions of the final product; Step 3, preparing the inner lining layer (2): Covering the selected plastic film on the mold, heating the mold, controlling the mold surface temperature to be 10°C-15°C higher than the heat shrinkage temperature or softening temperature of the plastic film, and lower than the melting temperature of the plastic film, and continuing to heat until the plastic film shrinks or softens and adheres tightly to the mold surface; Step 4: Composite interface treatment: evenly apply surface treatment agent on the surface of the plastic film to improve the inert surface of the plastic material; Step 5: Making the main structure: making the membrane shell main structure (1) outside the plastic film and curing it; Step 6: Structural protection: corrosion protection treatment is performed on the openings on the membrane housing main structure (1) and the exposed membrane housing main structure (1) at the raw water inlet and the concentrated water inlet installation plane.

2. The method for manufacturing a corrosion-resistant membrane housing according to claim 1, characterized in that: The plastic film in step 2 has a thickness h in the range of 0.2 mm ≤ h ≤ 2 mm after heat shrinkage, a shrinkage temperature ≥ 70° C., a melting temperature ≥ 185° C., a surface roughness ≤ 0.8 μm, a radial shrinkage rate ≥ 10%, an axial shrinkage rate ≤ 10%, and an elongation at break ≥ 10%.

3. The method for manufacturing a corrosion-resistant membrane housing according to claim 1 or 2, characterized in that: In step 2, the plastic film is in a cylindrical shape, and the circumference L of the cylinder satisfies: L0·(1+a)≥L≥L0·1.1 Where L0 is the circumference of the mold and a is the radial shrinkage rate of the plastic film.

4. The method for manufacturing a corrosion-resistant membrane housing according to claim 1 or 2, characterized in that: In the step 2, the softening temperature of the plastic film is T1≤T min , T min The lowest curing temperature in the formula curing system; the melting temperature of the plastic film T2 ≥ T max , T max It is the highest curing temperature in the formula curing system.

5. The method for manufacturing a corrosion-resistant membrane housing according to claim 1, characterized in that: In step 3, the coverage area S of the plastic film on the mold satisfies: S≥S0 / (1-b) Where S0 is the area of ​​the product to be produced, and b is the axial shrinkage rate of the plastic film.

6. The method for manufacturing a corrosion-resistant membrane housing according to claim 1, wherein: In the sixth step, a plastic film is covered on the exposed position of the membrane shell main structure (1), and overlapped with the plastic film at the inner lining layer (2), with the overlap length being 5mm-10mm; the plastic film at the exposed position is heated to soften it, and pressure is applied to the softened plastic film by a tool to connect it to the plastic film at the inner lining layer (2).

7. The method for manufacturing a corrosion-resistant membrane housing according to claim 1, wherein: In the sixth step, a plastic film is covered on the exposed membrane shell main structure (1), and the plastic film is made of the same material as the inner lining layer (2); the plastic film and the inner lining layer (2) are overlapped, and the overlap length is 5-10 mm; Use a plastic welding gun and plastic welding rod to perform heat welding on the overlapping seams.

8. The method for manufacturing a corrosion-resistant membrane housing according to claim 1, wherein: In step six, the same material as the inner lining layer (2) is selected, melted into liquid form, and then evenly coated on the exposed membrane shell main structure (1). After it cools and hardens, the surface is polished.

9. The method for manufacturing a corrosion-resistant membrane housing according to claim 1, wherein: In the step six, a corrosion-resistant coating is sprayed on the exposed membrane housing main structure (1) or a sealing ring is installed.

10. A corrosion-resistant membrane housing structure manufactured by the corrosion-resistant membrane housing manufacturing method according to claim 1, characterized in that: The invention comprises a membrane shell main structure (1), wherein an inner lining layer (2) is provided on the inner side of the membrane shell main structure (1), and the inner lining layer (2) is made of corrosion-resistant material.

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