Super-hydrophobic filter material and method for making the same

Abstract

The application relates to the technical field of filtering materials, and particularly discloses a super-hydrophobic filtering material and a preparation method thereof.A super-hydrophobic filtering material comprises a non-woven fabric, a super-hydrophobic layer, an antibacterial layer and a super-hydrophobic layer; and the preparation method of a super-hydrophobic modification solution used in the super-hydrophobic layer comprises the following steps: mixing polylactic acid, nano-silicon dioxide, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate, and then adding a solvent to prepare the super-hydrophobic modification solution.The super-hydrophobic filtering material is formed by alternately stacking the super-hydrophobic layer and the antibacterial layer, and the filtering material has a double function, good hydrophobicity, oleophobicity and antistatic property, efficient filtering and easy maintenance, and has a wide application prospect in the fields of air purification, water treatment, medical protection and the like.

Description

Technical Field

[0001] This invention relates to the field of filtration materials technology, and in particular to a superhydrophobic filtration material and its preparation method. Background Technology

[0002] Due to the rapid development of the chemical fiber industry in recent years, a large number of new fiber fabric products with diverse properties and wide applications have emerged in the market. These products provide a wealth of new materials for the filtration field. Scientific research has found that nonwoven fabrics have superior filtration performance compared to traditional knitted fabrics. Furthermore, the production process of nonwoven fabrics is relatively simple and quick, with lower costs, and can be mass-produced with high output and stable quality. These characteristics give it significant advantages in cost control and production efficiency. Therefore, nonwoven fabrics have gradually distinguished themselves in the filtration field, becoming the preferred mainstream application material for many industries and widely used in key areas such as air purification, water treatment, and medical protection.

[0003] Currently, while there are many types of filter materials on the market, primarily non-woven fabrics, their performance still needs improvement, especially in terms of hydrophobicity and antibacterial properties. Traditional filter materials often suffer from limitations in filtration efficiency and lifespan when facing humid environments, oily pollutants, or microorganisms. Therefore, developing a new type of filter material that simultaneously possesses superhydrophobicity and antibacterial properties is of great significance for improving filtration efficiency, extending service life, and ensuring environmental safety. Summary of the Invention

[0004] To improve the hydrophobicity of filter materials, this application provides a superhydrophobic filter material and its preparation method. The superhydrophobic filter material of this application comprises a non-woven fabric, a superhydrophobic layer, an antibacterial layer, and another superhydrophobic layer, wherein the superhydrophobic layer and the antibacterial layer are alternately stacked to form a filter material with dual functions. It can not only effectively block water molecules and oils but also inhibit bacterial growth. Furthermore, its excellent hydrophobic properties endow the filter material with good self-cleaning ability, making it highly efficient and easy to maintain. It has broad application prospects in multiple fields such as air purification, water treatment, and medical protection.

[0005] Firstly, the superhydrophobic filter material provided in this application adopts the following technical solution: A superhydrophobic filter material, comprising, in sequence, a nonwoven fabric, a superhydrophobic layer, an antibacterial layer, and another superhydrophobic layer; the preparation method of the superhydrophobic modification solution used in the superhydrophobic layer includes the following steps: s1-1: Polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:(1-5):(1-2):(0.1-0.3) to obtain a hydrophobic mixture; s1-2: A superhydrophobic modified solution is prepared by adding a solvent to a hydrophobic mixture, wherein the mass percentage concentration of the hydrophobic mixture is 8%-16%.

[0006] In the above technical solution, this application further adds a superhydrophobic layer, an antibacterial layer, and another superhydrophobic layer to a nonwoven fabric to obtain a filter material with dual functions of hydrophobic self-cleaning and antibacterial properties. The superhydrophobic layer is prepared using a superhydrophobic modification solution made of polylactic acid, nano-silica, polyethylene glycol diglycidyl ether, and sodium p-toluenesulfonate, thereby improving the hydrophobic performance of the filter material. Polylactic acid, as the main hydrophobic component, contains a large number of hydrophobic groups on its molecular chain, which gives the superhydrophobic layer excellent hydrophobic properties. The addition of nano-silica not only enhances the superhydrophobic effect but also provides additional oil repellency and antistatic properties. The addition of sodium p-toluenesulfonate and polyethylene glycol diglycidyl ether promotes the formation of a stable three-dimensional network structure in the superhydrophobic layer, thereby improving the stability and durability of the superhydrophobic layer.

[0007] Preferably, the mass ratio of polylactic acid, nano silica, polyethylene glycol diglycidyl ether, and sodium p-toluenesulfonate is 10:2:2:0.2.

[0008] In the above technical solution, this application further improves the performance of the superhydrophobic layer by optimizing the mass ratio of polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate to 10:2:2:0.2.

[0009] Preferably, the method for preparing the antibacterial modified solution used in the antibacterial layer includes the following steps: s2-1: Chitosan and curcumin are mixed at a mass ratio of 2:(0.5-1) to obtain an antibacterial mixture; s2-2: Add solvent to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%-18%.

[0010] In the above technical solution, this application uses chitosan and curcumin to prepare an antibacterial modified solution. Through the synergistic effect of chitosan and curcumin, and leveraging the antibacterial properties of chitosan and the natural antibacterial characteristics of curcumin, an antibacterial layer with highly efficient antibacterial capabilities is prepared. Chitosan, as a natural polymer material, possesses good biocompatibility and antibacterial properties, while curcumin also exhibits good antibacterial activity. The combination of the two endows the antibacterial layer with excellent antibacterial properties, further improving the overall performance of the filter material.

[0011] Preferably, the antibacterial mixture further includes nano-zinc oxide and sodium p-toluenesulfonate, wherein the mass ratio of chitosan, curcumin, nano-zinc oxide and sodium p-toluenesulfonate is 2:(0.5-1):(0.5-1):(0.1-0.2).

[0012] In the above technical solution, this application further improves the antibacterial and antistatic properties of the filter material by adding nano-zinc oxide and sodium p-toluene as main components in the preparation of the antibacterial layer, based on chitosan and curcumin. Chitosan has good biocompatibility, curcumin has excellent antibacterial properties, and nano-zinc oxide, as a nano-antibacterial agent, can effectively inhibit the growth of various bacteria while also improving the antistatic properties of the filter material. The addition of sodium p-toluene not only promotes the uniform dispersion of the antibacterial mixture but also further enhances the antibacterial effect of the antibacterial layer.

[0013] Preferably, the solvent of the superhydrophobic modified solution is N,N-dimethylformamide, and the solvent of the antibacterial modified solution is N,N-dimethylformamide.

[0014] In the above technical solution, this application uses N,N-dimethylformamide as a specific solvent, which has good solubility and stability, and can ensure the uniformity and stability of the superhydrophobic modified solution and the antibacterial modified solution.

[0015] Preferably, the nonwoven fabric is a polyester needle-punched nonwoven fabric with a specification of 100g / m². 2 .

[0016] In the above technical solution, this application uses a non-selective specification of 100g / m 2 Polyester needle-punched nonwoven fabric further improves the filtration performance of filter materials.

[0017] Secondly, the method for preparing a superhydrophobic filter material provided in this application adopts the following technical solution: A method for preparing a superhydrophobic filter material includes the following steps: Step 1: Take a non-woven fabric, spray a superhydrophobic modification solution onto the non-woven fabric, and obtain the first superhydrophobic layer after drying; Step 2: On the first superhydrophobic layer, continue to spray the antibacterial modification solution, and after drying, the antibacterial layer is obtained; Step 3: Continue to spray the superhydrophobic modification solution onto the antibacterial layer, and after drying, a second superhydrophobic layer is obtained, which is the superhydrophobic filter material.

[0018] In the above technical solution, this application, through the aforementioned steps, can obtain a superhydrophobic filter material with excellent hydrophobicity and antibacterial properties. This material not only effectively blocks water molecules and oils but also inhibits bacterial growth. Furthermore, its excellent hydrophobic properties endow the filter material with good self-cleaning ability, making it highly efficient and easy to maintain. Moreover, the preparation process of the superhydrophobic filter material of this application is simple, low-cost, and easy to industrialize.

[0019] Preferably, the coating thickness of the first superhydrophobic layer is 5-10 μm, the coating thickness of the antibacterial layer is 25-30 μm, and the coating thickness of the second superhydrophobic layer is 5-10 μm.

[0020] In the above technical solution, this application forms a superhydrophobic layer and an antibacterial layer on the nonwoven fabric by spraying. By optimizing the layer thickness of the superhydrophobic layer and the antibacterial layer, the performance stability of the filter material is ensured, and the service life of the filter material is further extended.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. This application significantly improves the hydrophobic properties of filter materials by using a superhydrophobic modification solution formulated with polylactic acid, nano-silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate, giving it a stronger ability to repel water and oil, thereby effectively preventing the filter materials from being contaminated, improving its self-cleaning ability, and extending its service life.

[0022] 2. This application significantly improves the ability of filter materials to inhibit bacteria and significantly improves the antibacterial stability of filter materials by using an antibacterial modified solution formulated with chitosan, curcumin, nano zinc oxide and sodium p-toluenesulfonate. This helps to reduce the growth and reproduction of bacteria on the surface of filter materials, thereby reducing the health risks caused by bacterial contamination.

[0023] 3. This application uses polyester nonwoven fabric as the base material, which not only provides good mechanical strength and stability, but also its lightweight and breathable characteristics enable the filter material to maintain high-efficiency filtration performance while having low air resistance, thus significantly improving filtration efficiency. Detailed Implementation

[0024] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0025] Example 1 A method for preparing a superhydrophobic filter material includes the following steps: Step 1: Take 100g / m 2 A 1.5mm thick polyester needle-punched nonwoven fabric is coated with a superhydrophobic modification solution, and the coating thickness is 10μm. After drying, the first superhydrophobic layer is obtained.

[0026] The preparation method of the superhydrophobic modified solution includes the following steps: s1-1: Polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:1:1:0.1 to obtain a hydrophobic mixture.

[0027] s1-2: N,N-dimethylformamide is added to the hydrophobic mixture to prepare a superhydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0028] Step 2: On the first superhydrophobic layer, continue to spray the antibacterial modification solution, with a coating thickness of 30μm. After drying, the antibacterial layer is obtained.

[0029] The preparation method of the antibacterial modified solution includes the following steps: s2-1: Chitosan and curcumin are mixed at a mass ratio of 2:0.5 to obtain an antibacterial mixture.

[0030] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 18%.

[0031] Step 3: Continue to spray the superhydrophobic modification solution onto the antibacterial layer, with a coating thickness of 10μm. After drying, a second superhydrophobic layer is obtained, which is the superhydrophobic filter material.

[0032] Among them, the polyester needle-punched nonwoven fabric is produced by Guangzhou Kailujia Nonwoven Fabric Co., Ltd.

[0033] Polylactic acid was purchased from Hubei Xinyuhong Biomedical Technology Co., Ltd.

[0034] The nano-silica was purchased from Qinghe County Chaotai Metal Materials Co., Ltd., with a particle size between 100-200nm.

[0035] The polyethylene glycol diglycidyl ether was purchased from Shandong Shangwei Chemical Import & Export Co., Ltd.

[0036] Sodium p-toluenesulfonate was purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.

[0037] Chitosan was purchased from Guangdong Hongyou Biotechnology Co., Ltd.

[0038] Curcumin was purchased from Guangdong Hongyou Biotechnology Co., Ltd., with a content of 95%.

[0039] N,N-dimethylformamide was purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.

[0040] Example 2 A method for preparing a superhydrophobic filter material, which differs from Example 1, includes the following steps: Step 1: Take 100g / m 2 A 1.5mm thick polyester needle-punched nonwoven fabric is coated with a superhydrophobic modification solution, and the coating thickness is 5μm. After drying, the first superhydrophobic layer is obtained.

[0041] The preparation method of the superhydrophobic modified solution includes the following steps: s1-1: A hydrophobic mixture is obtained by mixing polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate in a mass ratio of 10:5:2:0.3.

[0042] s1-2: N,N-dimethylformamide is added to the hydrophobic mixture to prepare a superhydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 8%.

[0043] Step 2: On the first superhydrophobic layer, continue to spray the antibacterial modification solution, with a coating thickness of 25μm. After drying, the antibacterial layer is obtained.

[0044] The preparation method of the antibacterial modified solution includes the following steps: s2-1: Chitosan and curcumin are mixed in a mass ratio of 2:1 to obtain an antibacterial mixture.

[0045] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%.

[0046] Step 3: Continue to spray the superhydrophobic modification solution onto the antibacterial layer, with a coating thickness of 5μm. After drying, a second superhydrophobic layer is obtained, which is the superhydrophobic filter material.

[0047] Example 3 A method for preparing a superhydrophobic filter material, which differs from Example 1, includes the following steps: Step 1: Take 100g / m 2 A 1.5mm thick polyester needle-punched nonwoven fabric is coated with a superhydrophobic modification solution, and the coating thickness is 8μm. After drying, the first superhydrophobic layer is obtained.

[0048] The preparation method of the superhydrophobic modified solution includes the following steps: s1-1: Polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:3:1.5:0.2 to obtain a hydrophobic mixture.

[0049] s1-2: N,N-dimethylformamide is added to the hydrophobic mixture to prepare a superhydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 12%.

[0050] Step 2: On the first superhydrophobic layer, continue to spray the antibacterial modification solution, with a coating thickness of 27μm. After drying, the antibacterial layer is obtained.

[0051] The preparation method of the antibacterial modified solution includes the following steps: s2-1: Chitosan and curcumin are mixed at a mass ratio of 2:0.8 to obtain an antibacterial mixture.

[0052] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 16%.

[0053] Step 3: Continue to spray the superhydrophobic modification solution onto the antibacterial layer, with a coating thickness of 8μm. After drying, a second superhydrophobic layer is obtained, which is the superhydrophobic filter material.

[0054] Example 4 A method for preparing a superhydrophobic filter material, which differs from Example 1, A method for preparing a superhydrophobic filter material, differing from Example 1 in that the preparation method of the antibacterial modified solution in step 2 includes the following steps: s2-1: Chitosan, curcumin and nano zinc oxide are mixed in a mass ratio of 2:1:0.5 to obtain an antibacterial mixture.

[0055] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%.

[0056] Example 5 A method for preparing a superhydrophobic filter material, differing from Example 1 in that the preparation method of the antibacterial modified solution in step 2 includes the following steps: s2-1: Chitosan, curcumin and sodium p-toluenesulfonate are mixed in a mass ratio of 2:1:0.1 to obtain an antibacterial mixture.

[0057] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%.

[0058] Example 6 A method for preparing a superhydrophobic filter material, differing from Example 1 in that the preparation method of the antibacterial modified solution in step 2 includes the following steps: s2-1: Chitosan, curcumin, nano zinc oxide and sodium p-toluenesulfonate are mixed in a mass ratio of 2:1:0.5:0.1 to obtain an antibacterial mixture.

[0059] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%.

[0060] The nano zinc oxide was purchased from Hangzhou Jikang New Materials Co., Ltd., with a particle size between 100-200nm.

[0061] Example 7 A method for preparing a superhydrophobic filter material, differing from Example 1 in that the preparation method of the antibacterial modified solution in step 2 includes the following steps: s2-1: Chitosan, curcumin, nano zinc oxide and sodium p-toluenesulfonate are mixed in a mass ratio of 2:1:1:0.2 to obtain an antibacterial mixture.

[0062] s2-2: N,N-dimethylformamide is added to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%.

[0063] Comparative Example 1 A method for preparing a superhydrophobic filter material, differing from Example 1 in that step 1, the preparation method of the superhydrophobic modified solution includes the following steps: s1-1: Polylactic acid, nano zinc oxide, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:1:1:0.1 to obtain a hydrophobic mixture.

[0064] s1-2: N,N-dimethylformamide is added to the hydrophobic mixture to prepare a superhydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0065] Comparative Example 2 A method for preparing a superhydrophobic filter material, differing from Example 1 in that step 1, the preparation method of the superhydrophobic modified solution includes the following steps: s1-1: A hydrophobic mixture is obtained by mixing polylactic acid, nano silica, polypropylene glycol diglycidyl ether and sodium p-toluenesulfonate in a mass ratio of 10:1:1:0.1.

[0066] s1-2: N,N-dimethylformamide is added to the hydrophobic mixture to prepare a superhydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0067] Comparative Example 3 A method for preparing a superhydrophobic filter material, differing from Example 1 in that step 1, the preparation method of the superhydrophobic modified solution includes the following steps: s1-1: Polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium dodecylbenzenesulfonate are mixed in a mass ratio of 10:1:1:0.1 to obtain a hydrophobic mixture.

[0068] s1-2: N,N-dimethylformamide is added to the hydrophobic mixture to prepare a superhydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0069] Performance testing The filtration efficiency of the above-mentioned filter materials was tested according to GB / T6719-2009. The oleophobicity rating of the above-mentioned filter materials was tested according to GB / T19977-2014. The hydrophobicity of the above-mentioned filter materials was tested using a surface water contact angle test. The antibacterial rate of the above-mentioned filter materials against Staphylococcus aureus and Escherichia coli was tested according to GB / T20944-2008. The surface resistivity of the above-mentioned filter materials was tested according to GB / T 24249-2009. The test results are shown in Table 1.

[0070] Table 1: As can be seen from the data in Table 1, the filter materials of Examples 1 to 7 all exhibit excellent performance in terms of filtration efficiency, oleophobicity level, contact angle, antibacterial rate, and surface resistivity. This indicates that the superhydrophobic filter material provided in this application possesses excellent overall performance.

[0071] Specifically, comparing Example 1 and Comparative Examples 1-3, Comparative Example 1 replaced nano-silica with nano-zinc oxide, Comparative Example 2 replaced polyethylene glycol diglycidyl ether with polypropylene glycol diglycidyl ether, and Comparative Example 3 replaced sodium p-toluenesulfonate with sodium dodecylbenzenesulfonate. Example 1 exhibits good overall performance. This indicates that in the preparation process of superhydrophobic filter materials, the superhydrophobic modification solution prepared from polylactic acid, nano-silica, polyethylene glycol diglycidyl ether, and sodium p-toluenesulfonate can significantly improve the hydrophobic and oleophobic properties of the filter material, better enhance its self-cleaning ability, and extend its service life.

[0072] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A superhydrophobic filter material, characterized in that, The superhydrophobic filter material comprises, in sequence, a nonwoven fabric, a superhydrophobic layer, an antibacterial layer, and another superhydrophobic layer; all of the superhydrophobic layers are prepared from a superhydrophobic modification solution. The preparation method of the superhydrophobic modified solution used in the superhydrophobic layer includes the following steps: s1-1: Polylactic acid, nano silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:(1-5):(1-2):(0.1-0.3) to obtain a hydrophobic mixture; s1-2: A superhydrophobic modified solution is prepared by adding a solvent to a hydrophobic mixture, wherein the mass percentage concentration of the hydrophobic mixture is 8%-16%.

2. The superhydrophobic filter material according to claim 1, characterized in that, The mass ratio of polylactic acid, nano silica, polyethylene glycol diglycidyl ether, and sodium p-toluenesulfonate is 10:2:2:0.

2.

3. The superhydrophobic filter material according to claim 1, characterized in that, The preparation method of the antibacterial modified solution used in the antibacterial layer includes the following steps: s2-1: Chitosan and curcumin are mixed at a mass ratio of 2:(0.5-1) to obtain an antibacterial mixture; s2-2: Add solvent to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%-18%.

4. The superhydrophobic filter material according to claim 3, characterized in that, The antibacterial mixture also includes nano zinc oxide and sodium p-toluenesulfonate, wherein the mass ratio of chitosan, curcumin, nano zinc oxide and sodium p-toluenesulfonate is 2:(0.5-1):(0.5-1):(0.1-0.2).

5. The superhydrophobic filter material according to claim 1, characterized in that, The solvent of the superhydrophobic modified solution is N,N-dimethylformamide, and the solvent of the antibacterial modified solution is N,N-dimethylformamide.

6. The superhydrophobic filter material according to claim 1, characterized in that, The nonwoven fabric is a polyester needle-punched nonwoven fabric with a specification of 100g / m². 2 .

7. A method for preparing a superhydrophobic filter material as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Take a non-woven fabric, spray a superhydrophobic modification solution onto the non-woven fabric, and obtain the first superhydrophobic layer after drying; Step 2: On the first superhydrophobic layer, continue to spray the antibacterial modification solution, and after drying, the antibacterial layer is obtained; Step 3: Continue to spray the superhydrophobic modification solution onto the antibacterial layer. After drying, a second superhydrophobic layer is obtained, which is the superhydrophobic filter material.

8. The method for preparing a superhydrophobic filter material according to claim 7, characterized in that, The coating thickness of the first superhydrophobic layer is 5-10 μm, the coating thickness of the antibacterial layer is 25-30 μm, and the coating thickness of the second superhydrophobic layer is 5-10 μm.

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