Microporous PVDF (Polyvinylidene Fluoride) membrane for filter element

Abstract

The utility model relates to the technical field of PVDF (Polyvinylidene Fluoride) membranes, in particular to a microporous PVDF membrane for a filter element, which comprises a PVDF membrane body, the upper surface of the PVDF membrane body is fixedly connected with an activated carbon layer, and the lower surface of the PVDF membrane body is fixedly connected with a hydrophilic modified layer. According to the utility model, the wastewater is filtered, peculiar smell, pigments, part of heavy metal ions and the like in the wastewater can be adsorbed, dirt particles can be prevented from being attached and accumulated on the surface of the membrane, and meanwhile, through the corrosion-resistant layer, the corrosion resistance of the membrane is improved. The film body structure can be effectively prevented from being corroded by external acid, alkali, salt and other corrosive chemical substances, so that the key structure and performance of the film are protected, in addition, the supporting layer provides strong mechanical supporting force for the whole film structure, external force such as pressure, pulling force and friction force borne by the film in the using process can be borne, and the service life of the film is prolonged. The conditions of rupture, deformation or damage and the like of the film are prevented.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a microporous PVDF membrane for filter cartridges. Background Technology

[0002] With the increasing demands for filtration precision and efficiency across industries, traditional filter materials are no longer sufficient. PVDF (polyvinylidene fluoride) membranes, due to their excellent chemical stability, thermal stability, and mechanical properties, have broad application prospects in the filtration field. Among numerous materials for wastewater treatment, membrane materials, as a novel material, offer excellent filtration performance and cost-effectiveness. In existing technologies, wastewater treatment membranes are typically single-layered, and these membranes are frequently clogged by large molecular impurities in the wastewater, resulting in poor filtration efficiency. Utility Model Content

[0003] The purpose of this utility model is to solve the technical problems mentioned in the background art.

[0004] The present invention adopts the following technical solution: a microporous PVDF membrane for filter cartridges, comprising a PVDF membrane body, wherein an activated carbon layer is fixedly connected to the upper surface of the PVDF membrane body, and a hydrophilic modified layer is fixedly connected to the lower surface of the PVDF membrane body.

[0005] Preferably, a corrosion-resistant layer is fixedly connected to the lower surface of the hydrophilic modified layer. This effectively blocks the erosion of the membrane structure by external acids, alkalis, salts, and other corrosive chemicals, thereby protecting the membrane's critical structure and performance.

[0006] Preferably, a support layer is fixedly connected to the surface of the activated carbon layer, and the support layer is made of non-woven fabric. Here, it provides strong mechanical support for the entire membrane structure. The non-woven fabric has a certain degree of flexibility and strength, and can withstand the external forces such as pressure, tension and friction that the membrane is subjected to during use, preventing the membrane from cracking, deforming or being damaged. Especially in high-pressure filtration environments or frequent cleaning operations, the support layer plays a key protective role.

[0007] Preferably, the activated carbon layer is located between the support layer and the PVDF membrane. Here, the activated carbon layer can directly contact the liquid to be filtered, and by utilizing its porosity and large specific surface area, it adsorbs impurities such as organic pollutants, odor substances, pigments, and some heavy metal ions in the liquid.

[0008] Preferably, the hydrophilic modified layer is composed of inorganic nanoparticles. This results in a membrane surface with improved hydrophilicity. The hydrophilic surface reduces the surface tension between the liquid and the membrane, making it easier for the liquid to spread and penetrate the membrane surface, reducing membrane fouling, and preventing the adhesion and accumulation of dirt particles on the membrane surface.

[0009] Preferably, the PVDF membrane has filter pores evenly distributed on its surface. This ensures uniform filtration performance across the entire membrane surface, avoiding significant local variations in filtration efficiency. It also achieves efficient retention of impurities such as fine particles and colloids, guaranteeing the purity and quality of the filtered liquid.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] This invention comprises a PVDF membrane, a support layer, a corrosion-resistant layer, an activated carbon layer, and a hydrophilic modification layer. During use, the wastewater to be filtered first contacts the corrosion-resistant layer, then passes through the corrosion-resistant layer and the hydrophilic modification layer into the interior of the PVDF membrane. The wastewater filtered by the PVDF membrane then passes through the activated carbon layer for further filtration and adsorption, and finally exits through the support layer. This achieves wastewater filtration and also adsorbs odors, pigments, and some heavy metal ions in the wastewater, while preventing the adhesion and accumulation of dirt particles on the membrane surface. Simultaneously, the corrosion-resistant layer effectively blocks external acids, alkalis, salts, and other corrosive chemicals from eroding the membrane structure, thus protecting the membrane's key structures and performance. Furthermore, the support layer provides strong mechanical support for the entire membrane structure, capable of withstanding external forces such as pressure, tension, and friction during use, preventing the membrane from cracking, deforming, or being damaged. Attached Figure Description

[0012] Figure 1 A schematic diagram of a microporous PVDF membrane for filter cartridges is provided for this utility model;

[0013] Figure 2 This invention proposes a microporous PVDF membrane for filter cartridges. Figure 1 Enlarged view of point A in the middle;

[0014] Figure 3 This invention presents a schematic diagram of a PVDF phantom for a microporous PVDF membrane used in filter cartridges.

[0015] Legend:

[0016] 1. Support layer; 2. Corrosion-resistant layer; 3. Activated carbon layer; 4. PVDF membrane; 5. Hydrophilic modified layer; 6. Filter pores. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example

[0020] Please see Figure 1-3 This utility model provides a technical solution: a microporous PVDF membrane for filter cartridges, comprising a PVDF membrane body 4. An activated carbon layer 3 is fixedly connected to the upper surface of the PVDF membrane body 4, and a hydrophilic modified layer 5 is fixedly connected to the lower surface of the PVDF membrane body 4. A corrosion-resistant layer 2 is fixedly connected to the lower surface of the hydrophilic modified layer 5. This effectively blocks the erosion of the membrane structure by external acids, alkalis, salts, and other corrosive chemicals, thereby protecting the key structure and performance of the membrane. A support layer 1, made of non-woven fabric, is fixedly connected to the surface of the activated carbon layer 3. This support layer 1 provides strong mechanical support for the entire membrane structure. The non-woven fabric has a certain degree of flexibility and strength, capable of withstanding external forces such as pressure, tension, and friction during use, preventing the membrane from cracking, deforming, or being damaged. Especially in high-pressure filtration environments or frequent cleaning operations, the support layer 1 plays a crucial protective role. The activated carbon layer 3 is located between the support layer 1 and the PVDF membrane 4. Here, the activated carbon layer 3 can directly contact the liquid to be filtered, utilizing its porosity and large specific surface area to adsorb organic pollutants, odor substances, pigments, and some heavy metal ions from the liquid. The hydrophilic modification layer 5 is composed of inorganic nanoparticles, which improves the hydrophilicity of the membrane surface. The hydrophilic surface reduces the surface tension between the liquid and the membrane, making it easier for the liquid to spread and penetrate the membrane surface, reducing membrane fouling and preventing the adhesion and accumulation of dirt particles on the membrane surface. The PVDF membrane 4 has filter pores 6 evenly distributed on its surface, ensuring uniform filtration performance across the entire membrane surface and avoiding excessive differences in local filtration effects. This achieves efficient retention of small particles, colloids, and other impurities, ensuring the purity and quality of the filtered liquid.

[0021] Working principle: During use, the wastewater to be filtered first comes into contact with the corrosion-resistant layer 2, then passes through the corrosion-resistant layer 2 and the hydrophilic modified layer 5 into the interior of the PVDF membrane 4. The wastewater filtered by the PVDF membrane 4 then passes through the activated carbon layer 3 for further filtration and adsorption, and finally is discharged through the support layer 1. This process achieves wastewater filtration and also adsorbs odors, pigments, and some heavy metal ions in the wastewater. It also prevents the adhesion and accumulation of dirt particles on the membrane surface. At the same time, the corrosion-resistant layer 2 effectively blocks the erosion of the membrane structure by external acids, alkalis, salts, and other corrosive chemicals, thereby protecting the key structure and performance of the membrane. In addition, the support layer 1 provides strong mechanical support for the entire membrane structure, which can withstand the external forces such as pressure, tension, and friction during use, preventing the membrane from cracking, deforming, or being damaged.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A microporous PVDF membrane for filter cartridges, comprising a PVDF membrane body (4), characterized in that: An activated carbon layer (3) is fixedly connected to the upper surface of the PVDF membrane (4), and a hydrophilic modified layer (5) is fixedly connected to the lower surface of the PVDF membrane (4).

2. The microporous PVDF membrane for filter cartridges according to claim 1, characterized in that: A corrosion-resistant layer (2) is fixedly connected to the lower surface of the hydrophilic modified layer (5).

3. The microporous PVDF membrane for filter cartridges according to claim 1, characterized in that: The surface of the activated carbon layer (3) is fixedly connected to a support layer (1), which is made of non-woven fabric.

4. The microporous PVDF membrane for filter cartridges according to claim 1, characterized in that: The activated carbon layer (3) is located between the support layer (1) and the PVDF membrane (4).

5. The microporous PVDF membrane for filter cartridges according to claim 1, characterized in that: The hydrophilic modified layer (5) is composed of inorganic nanoparticles.

6. The microporous PVDF membrane for filter cartridges according to claim 1, characterized in that: The PVDF membrane (4) has filter holes (6) on its surface, and the filter holes (6) are evenly distributed on the surface of the PVDF membrane (4).

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