External pressure type hollow fiber membrane

Abstract

The utility model provides an external pressure type hollow fiber membrane, and relates to the technical field of fiber membranes. The external pressure type hollow fiber membrane comprises a double-layer membrane pore structure, the double-layer membrane pore structure comprises an inner layer and an outer layer, an additive reinforcing structure is uniformly dispersed in a membrane material matrix, and the outer layer is embedded in the inner layer. The external pressure type hollow fiber membrane solves the problems that the size and the distribution uniformity of membrane holes of a conventional fiber membrane are difficult to accurately control, so that the filtration precision of the membrane is unstable, and the interception effect difference on pollutants with different particle sizes is large, and realizes the effect of improving the filtration efficiency through the design of a double-layer membrane hole structure. The micropore structure of the inner layer can accurately intercept tiny pollutants, the macroporous structure of the outer layer ensures smooth passing of water flow, and the micropore structure and the macroporous structure are matched with each other, so that the interception efficiency of the membrane on pollutants with different particle sizes is improved, and the filtering precision is more stable. The external pressure type hollow fiber membrane has the beneficial effects that the service life of the fiber membrane can be prolonged, and the external pressure type hollow fiber membrane can adapt to more complex and severe working conditions.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fiber membranes, in particular to an external pressure type hollow fiber membrane. BACKGROUND

[0002] The fiber membrane refers to a membrane-shaped material with a certain thickness and pore structure formed by taking fibers as main constituent units. The special structure and surface properties of the fiber membrane are used to realize the separation of different substances or promote specific chemical reactions.

[0003] In the preparation process of the existing external pressure type hollow fiber membrane, the size and distribution uniformity of the membrane holes are difficult to accurately control, so that the filtration precision of the membrane is unstable, and the interception effect of the membrane on different particle size pollutants is quite different. CONTENT OF THE UTILITY MODEL

[0004] (I) Technical problem solved

[0005] In view of the deficiencies of the prior art, the application provides an external pressure type hollow fiber membrane, which solves the problems mentioned in the background.

[0006] (II) Technical scheme

[0007] In order to achieve the above purpose, the application is implemented by the following technical scheme: an external pressure type hollow fiber membrane, comprising a double-layer membrane hole structure, the double-layer membrane hole structure comprises an inner layer and an outer layer, and an additive reinforcing structure is uniformly dispersed in a membrane material matrix, and the outer layer is embedded in the inner layer.

[0008] By adopting the above technical scheme, the double-layer membrane hole structure can be designed, the microporous structure of the inner layer can accurately intercept small pollutants, the macroporous structure of the outer layer can ensure that the water flow passes smoothly, and the two cooperate with each other to improve the interception efficiency of the membrane on different particle size pollutants, so that the filtration precision is more stable. The additive reinforcing structure can significantly improve the chemical corrosion resistance and oxidation resistance of the membrane, prolong the service life of the fiber membrane, and adapt to more complex and harsh working conditions.

[0009] Preferably, the exchange rate of the solvent and the non-solvent is accurately controlled during the phase inversion process of the inner layer, so as to form a uniform and small microporous structure, and the outer layer uses polymer microspheres with a specific particle size as a template to form a mutually connected macroporous structure in the membrane material.

[0010] By adopting the above technical scheme, the inner layer can effectively intercept small particles, colloidal substances, most bacteria and viruses and the like, so as to ensure the filtration precision, the outer layer provides good mechanical support for the inner layer, and at the same time can guide the water flow to quickly pass through the membrane wire, thereby improving the flux of the membrane.

[0011] Preferably, the outer layer is coated with an anti-blocking coating made of an amphiphilic polymer material, the molecular structure of which comprises hydrophilic groups and hydrophobic groups.

[0012] By adopting the above technical scheme, the hydrophilic groups of the anti-blocking coating can interact with water molecules to form a hydration layer, so that the membrane filament surface is wrapped by water, reducing direct contact between the membrane filaments.

[0013] Preferably, the additive reinforcing structure comprises a fluorine-containing polymer additive, which is polytetrafluoroethylene micro powder.

[0014] By adopting the above technical scheme, the fluorine-containing polymer can form a dense protective film on the membrane surface, blocking strong acids and bases and oxidizing substances from corroding the membrane material, thereby improving the chemical corrosion resistance of the membrane.

[0015] Preferably, the additive reinforcing structure comprises an antioxidant, which is a hindered phenol.

[0016] By adopting the above technical scheme, the antioxidant can effectively capture free radicals generated during the use of the membrane material, inhibit the oxidation reaction, and prolong the service life of the membrane.

[0017] Preferably, the outer layer of the membrane filament is provided with a reinforcing rib, the fiber material of the reinforcing rib is glass fiber, and the reinforcing rib is tightly combined with the membrane material.

[0018] By adopting the above technical scheme, the reinforcing rib can effectively enhance the tensile and bending resistance of the membrane filament, prevent the membrane filament from breaking or deforming due to external force during use, and improve the overall stability and reliability of the membrane filament.

[0019] (III) Beneficial effects

[0020] The present application provides an external pressure type hollow fiber membrane. It has the following beneficial effects:

[0021] 1. The external pressure type hollow fiber membrane solves the problem that the size and distribution uniformity of the membrane hole are difficult to control accurately in the previous fiber membrane, leading to unstable filtration precision and large difference in the retention effect of different particle size pollutants, by setting a double-layer membrane hole structure. The design of the double-layer membrane hole structure can accurately retain small pollutants by the micro-porous structure of the inner layer, and the large-pore structure of the outer layer ensures smooth water flow, and the two cooperate with each other to improve the retention efficiency of the membrane for different particle size pollutants, making the filtration precision more stable.

[0022] 2. The outer pressure type hollow fiber membrane is provided with an additive reinforcing mechanism, and the use of fluoropolymer additives and antioxidants can significantly improve the chemical corrosion resistance and oxidation resistance of the membrane, prolong the service life of the fiber membrane, and adapt to more complex and harsh working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a front view of the appearance structure of the present application;

[0025] Figure 2 It is a schematic diagram of the inner layer structure of the present application;

[0026] Figure 3 It is a schematic diagram of the outer layer internal structure of the present application;

[0027] Figure 4 It is a schematic diagram of the section structure of the present application.

[0028] In the figure: 1, double-layer membrane hole structure; 11, inner layer; 12, outer layer; 2, anti-adhesion coating; 3, additive reinforcing structure; 31, fluoropolymer additive; 32, antioxidant; 4, reinforcing rib. DETAILED DESCRIPTION

[0029] It should be noted that in the description of the embodiments of the present application, the terms "front, rear, left, right, upper, lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] The present application will be further described in detail below by means of drawings and examples.

[0031] REFERENCE Figure 1 and Figure 2The embodiment of the present application provides an outer pressure type hollow fiber membrane, which comprises a double-layer membrane hole structure 1, the double-layer membrane hole structure 1 comprises an inner layer 11 and an outer layer 12, additive reinforcing structures 3 are uniformly dispersed in a membrane material matrix, the outer layer 12 is embedded in the inner layer 11, the double-layer membrane hole structure 1 can be used for allowing a to-be-filtered liquid to enter from the outside of the membrane, because the outer layer 12 has a large pore structure, water flow can quickly pass through the large pores of the outer layer 12, and meanwhile, larger particles and impurities are preliminarily intercepted in the outer layer 12. As the water flow continues to penetrate into the inner layer 11, the microporous structure of the inner layer 11 plays a fine filtering role, and small particles, colloids, bacteria and viruses and the like are intercepted, so that high-efficiency filtration of the liquid is realized. In the filtration process, the anti-adhesion coating 2 can prevent adhesion between membrane filaments, so that the flux stability of the membrane module is ensured, the fluorine-containing polymer additive 31 in the additive reinforcing structure 3 can be used for protecting the membrane material from chemical substance erosion, the antioxidant 32 inhibits oxidation of the membrane material, and the service life of the membrane is prolonged.

[0032] With reference to Figure 2 And Figure 3 In one aspect of the embodiment, the inner layer 11 is used for accurately controlling the exchange rate of a solvent and a non-solvent in a phase inversion process, so that a uniform and small microporous structure is formed, and the outer layer 12 is used for taking polymer microspheres with a specific particle size as a template to form a large pore structure that is interconnected in the membrane material.

[0033] The outer layer 12 is coated with an anti-adhesion coating 2, the anti-adhesion coating 2 is made of an amphiphilic polymer material, a molecular structure of the anti-adhesion coating 2 comprises a hydrophilic group and a hydrophobic group, the double-layer membrane hole structure 1 can be used for allowing a to-be-filtered liquid to enter from the outside of the membrane, because the outer layer 12 has a large pore structure, water flow can quickly pass through the large pores of the outer layer 12, and meanwhile, larger particles and impurities are preliminarily intercepted in the outer layer 12. As the water flow continues to penetrate into the inner layer 11, the microporous structure of the inner layer 11 plays a fine filtering role, and small particles, colloids, bacteria and viruses and the like are intercepted, so that high-efficiency filtration of the liquid is realized. In the filtration process, the anti-adhesion coating 2 can prevent adhesion between membrane filaments, so that the flux stability of the membrane module is ensured.

[0034] With reference to Figure 2 And Figure 3 In one aspect of the embodiment, the additive reinforcing structure 3 comprises a fluorine-containing polymer additive 31, and the fluorine-containing polymer additive 31 is polytetrafluoroethylene micro powder.

[0035] The additive reinforcing structure 3 comprises the fluorine-containing polymer additive 31, the fluorine-containing polymer additive 31 is polytetrafluoroethylene micro powder, the fluorine-containing polymer additive 31 in the additive reinforcing structure 3 can be used for protecting the membrane material from chemical substance erosion, the antioxidant 32 inhibits oxidation of the membrane material, and the service life of the membrane is prolonged.

[0036] With reference to Figure 1 And Figure 4In one aspect of the embodiment, the outer layer 12 of the membrane filament is internally provided with a reinforcing rib 4, the reinforcing rib 4 is made of glass fiber and is tightly combined with the membrane material, the mechanical properties of the membrane filament are enhanced by the reinforcing rib 4, so that the membrane filament can withstand certain external force, and the stability and reliability of the membrane during long-term use are ensured.

[0037] All the electrical equipment in the scheme is powered by external power supply.

[0038] Working principle: when the device is used, the liquid to be filtered enters from the outside of the membrane, as the outer layer 12 has a large pore structure, the water flow can quickly pass through the large pores of the outer layer 12, and larger particles and impurities are preliminarily intercepted in the outer layer 12. As the water flow continues to penetrate into the inner layer 11, the microporous structure of the inner layer 11 plays a fine filtering role, trapping small particles, colloids, bacteria and viruses, etc., thereby realizing efficient filtration of the liquid. In the filtration process, the anti-adhesion coating 2 can prevent the adhesion between the membrane filaments, ensuring the stability of the flux of the membrane assembly. The fluoropolymer additive 31 in the additive reinforced structure 3 protects the membrane material from chemical attack, the antioxidant 32 inhibits the oxidation of the membrane material, and the service life of the membrane is prolonged. The reinforcing rib 4 enhances the mechanical properties of the membrane filament, so that it can withstand certain external force, and ensures the stability and reliability of the membrane during long-term use.

[0039] It should be noted that the relational terms herein such as first and second and the like are used only to differentiate one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In addition, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the processes, methods, articles or devices comprising a series of elements include not only those elements, but also other elements not explicitly listed or inherent to such processes, methods, articles or devices.

[0040] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An outer pressure type hollow fiber membrane comprising a double layer membrane pore structure (1), characterized by: The double-layer film pore structure (1) comprises an inner layer (11) and an outer layer (12), and an additive reinforcing structure (3) is uniformly dispersed in the matrix of the film material, and the outer layer (12) is embedded in the inner layer (11).

2. The outer pressure type hollow fiber membrane according to claim 1, characterized by: The inner layer (11) precisely controls the exchange rate of solvents and non-solvents in the phase inversion process, thereby forming a uniform and fine microporous structure, and the outer layer (12) uses polymer microspheres with a specific particle size as a template to form a large pore structure interconnected in the film material.

3. The outer pressure type hollow fiber membrane according to claim 1, characterized by: The outer layer (12) is coated with an anti-blocking coating (2) made of an amphiphilic polymer material, and the molecular structure thereof contains hydrophilic groups and hydrophobic groups.

4. The outer pressure type hollow fiber membrane according to claim 1, characterized by: The additive reinforcing structure (3) comprises a fluoropolymer additive (31), and the fluoropolymer additive (31) is polytetrafluoroethylene micro powder.

5. The outer pressure type hollow fiber membrane according to claim 1, characterized by: The additive reinforcing structure (3) comprises an antioxidant (32), and the antioxidant (32) is a hindered phenol.

6. The outer pressure type hollow fiber membrane according to claim 1, wherein: The outer layer (12) is provided with a reinforcing rib (4) inside the film wire, and the fiber material adopted by the reinforcing rib (4) is glass fiber, and is tightly combined with the film material.

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