Super-hydrophobic filtering material and preparation method thereof

Abstract

The invention relates to the technical field of filtering materials, and particularly discloses a super-hydrophobic filtering material and a preparation method thereof. The super-hydrophobic filtering material comprises a non-woven fabric, a super-hydrophobic layer, an antibacterial layer and a super-hydrophobic layer, a preparation method of a super-hydrophobic modified solution used by the super-hydrophobic layer comprises the following steps: mixing polylactic acid, nano silicon dioxide, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate, and adding a solvent to prepare the super-hydrophobic modified solution. According to the super-hydrophobic filtering material, the super-hydrophobic layers and the antibacterial layers are alternately overlaid to form the filtering material with dual functions, and the filtering material has good hydrophobicity, oleophobicity and antistatic property, has the characteristics of efficient filtering and easy maintenance, and has wide application prospects in multiple fields of air purification, water treatment, medical protection and the like.

Description

Technical Field

[0001] The invention relates to the technical field of filter materials, and in particular to a super hydrophobic filter material and a preparation method thereof. Background Art

[0002] Due to the rapid development of the chemical fiber industry in recent years, a large number of new fiber fabric products with different performances and wide applications have emerged on the market, which provide a large number of new materials to choose from in the field of filtration. Scientific research has found that non-woven fabrics have better filtration performance than traditional needle-woven fabrics. At the same time, the production process of non-woven fabrics is relatively simple and fast, the cost is low, and it can be mass-produced with high output and stable quality. These characteristics give it significant advantages in cost control and production efficiency. Therefore, non-woven fabrics have gradually stood out in the field of filtration and have become the preferred mainstream application material in many industries. They are widely used in many key fields such as air purification, water treatment, and medical protection.

[0003] At present, although there are many types of non-woven filter materials on the market, their performance still needs to be improved, especially in terms of hydrophobicity and antibacterial properties. Traditional filter materials are often limited in their filtration efficiency and service life when facing humid environments, oily pollutants or microorganisms. Therefore, the development of a new type of filter material that is both super hydrophobic and antibacterial is of great significance for improving filtration efficiency, extending service life and ensuring environmental safety. Summary of the invention

[0004] In order to improve the hydrophobicity of the filter material, the present application provides a super-hydrophobic filter material and a preparation method thereof. The super-hydrophobic filter material of the present application includes a non-woven fabric, a super-hydrophobic layer, an antibacterial layer and a super-hydrophobic layer, wherein the super-hydrophobic layer and the antibacterial layer are alternately superimposed to form a filter material with dual functions, which can not only effectively block water molecules and grease, but also inhibit the growth of bacteria. At the same time, its good hydrophobic property also gives the filter material a good self-cleaning ability, so that the filter material has the characteristics of high-efficiency filtration and easy maintenance, and has broad application prospects in multiple fields such as air purification, water treatment, and medical protection.

[0005] In the first aspect, the present application provides a super hydrophobic filter material using the following technical solution: A super-hydrophobic filter material, the super-hydrophobic filter material sequentially comprises a non-woven fabric, a super-hydrophobic layer, an antibacterial layer and a super-hydrophobic layer; a method for preparing a super-hydrophobic modified solution used for the super-hydrophobic layer comprises 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: adding a solvent to the hydrophobic mixture to prepare a super-hydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 8%-16%.

[0006] In the above technical scheme, the present application obtains a filter material with hydrophobic self-cleaning and antibacterial dual effects by further increasing super-hydrophobic layer, antibacterial layer and super-hydrophobic layer on the basis of non-woven fabric, and a super-hydrophobic layer is prepared by using a super-hydrophobic modified solution prepared by polylactic acid, nano-silicon dioxide, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate, thereby improving the hydrophobicity of the filter material. Wherein, polylactic acid, as the main hydrophobic component, contains a large amount of hydrophobic groups on its molecular chain, which makes the super-hydrophobic layer have good hydrophobicity. The addition of nano-silicon dioxide not only enhances the super-hydrophobic effect, but also provides additional oil repellency and antistatic property. The addition of sodium p-toluenesulfonate and polyethylene glycol diglycidyl ether can cause the super-hydrophobic layer to form a stable three-dimensional network structure, thereby improving the stability and durability of the super-hydrophobic layer.

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

[0008] In the above technical scheme, the present application further improves the performance of the super hydrophobic 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 comprises the following steps: s2-1: chitosan and curcumin are mixed in a mass ratio of 2:(0.5-1) to obtain an antibacterial mixture; s2-2: adding a solvent to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%-18%.

[0010] In the above technical scheme, the present application prepares an antibacterial modified solution by using chitin and curcumin, and through the synergistic effect of chitin and curcumin, through the antibacterial properties of chitin and the natural antibacterial properties of curcumin, an antibacterial layer with high antibacterial ability is prepared. Among them, chitin, as a natural polymer material, has good biocompatibility and antibacterial properties, and curcumin also has good antibacterial effects. The combination of the two gives the antibacterial layer good antibacterial properties, further improving the comprehensive performance of the filter material.

[0011] Preferably, the antibacterial mixture also includes nano zinc oxide and sodium p-toluenesulfonate, and 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, the present application further improves the antibacterial and antistatic properties of the filter material by further adding nano zinc oxide and sodium p-toluenesulfonate as main components on the basis of chitin and curcumin in the preparation of the antibacterial layer. Among them, chitin 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 and improve the antistatic properties of the filter material. The addition of sodium p-toluenesulfonate can not only promote the uniform dispersion of the antibacterial mixture, but also further improve 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, the present application adopts 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, and the specification of the polyester needle-punched nonwoven fabric is 100g / m 2 .

[0016] In the above technical solution, the present application adopts no selection specification of 100g / m 2 Polyester needle-punched nonwoven fabric, which further improves the filtering performance of the filter material.

[0017] In the second aspect, the present application provides a method for preparing a super hydrophobic filter material using the following technical solution: A method for preparing a super-hydrophobic filter material comprises the following steps: Step 1: Take a non-woven fabric, spray a super-hydrophobic modification solution on the non-woven fabric, and obtain a first super-hydrophobic layer after drying; Step 2: Continue to spray the antibacterial modified solution on the first super-hydrophobic layer, and obtain the antibacterial layer after drying; Step 3: Continue to spray the super-hydrophobic modified solution on the antibacterial layer, and obtain a second super-hydrophobic layer after drying, that is, a super-hydrophobic filter material.

[0018] In the above technical scheme, the present application can obtain a super hydrophobic filter material with excellent hydrophobicity and antibacterial properties through the above steps. This material can not only effectively block water molecules and grease, but also inhibit the growth of bacteria. At the same time, its good hydrophobicity also gives the filter material a good self-cleaning ability, so that the filter material has the characteristics of efficient filtration and easy maintenance. At the same time, the super hydrophobic filter material of the present application has a simple preparation process, low cost, and is easy to realize industrial production.

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

[0020] In the above technical solution, the present application forms a super-hydrophobic layer and an antibacterial layer on the non-woven fabric by spraying, and by optimizing the layer thickness of the super-hydrophobic layer and the antibacterial layer, the performance of the filter material is ensured to be stable, and the service life of the filter material is further extended.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application significantly improves the hydrophobic properties of the filter material by using a super-hydrophobic modified solution prepared by polylactic acid, nano-silica, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate, making it have a stronger repellency against water and grease, thereby effectively preventing the filter material from being contaminated, improving its self-cleaning ability, and extending its service life.

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

[0023] 3. The present application adopts polyester non-woven fabric as the substrate, which not only provides good mechanical strength and stability, but also its light weight and breathable properties enable the filter material to have lower wind resistance while maintaining high-efficiency filtering performance, thereby significantly improving the filtering efficiency. DETAILED DESCRIPTION

[0024] In order to better illustrate the purpose, technical solutions 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 super-hydrophobic filter material comprises the following steps: Step 1: Take 100g / m 2 , a polyester needle-punched non-woven fabric with a thickness of 1.5 mm, a super-hydrophobic modification solution is sprayed on the non-woven fabric, the coating thickness is 10 μm, and the first super-hydrophobic layer is obtained after drying.

[0026] Wherein, the preparation method of super hydrophobic modified solution comprises 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 super-hydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0028] Step 2: Continue to spray the antibacterial modified solution on the first super-hydrophobic layer, with a coating thickness of 30 μm, and obtain an antibacterial layer after drying.

[0029] The method for preparing the antibacterial modified solution comprises the following steps: s2-1: chitosan and curcumin were mixed in a mass ratio of 2:0.5 to obtain an antibacterial mixture.

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

[0031] Step 3: Continue to spray the super-hydrophobic modified solution on the antibacterial layer, with a coating thickness of 10 μm. After drying, a second super-hydrophobic layer is obtained, that is, a super-hydrophobic filter material is obtained.

[0032] Among them, polyester needle-punched non-woven fabric is produced by Guangzhou Kailujia Non-woven Fabric Co., Ltd.

[0033] Among them, polylactic acid was purchased from Hubei Xinyuhong Biotechnology Co., Ltd.

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

[0035] Among them, polyethylene glycol diglycidyl ether was purchased from Shandong Shangwei Chemical Import and Export Co., Ltd.

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

[0037] Among them, chitin was purchased from Guangdong Hongyou Biotechnology Co., Ltd.

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

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

[0040] Example 2 A method for preparing a super-hydrophobic filter material, which is different from Example 1, comprises the following steps: Step 1: Take 100g / m 2 , a polyester needle-punched non-woven fabric with a thickness of 1.5 mm, a super-hydrophobic modification solution is sprayed on the non-woven fabric, the coating thickness is 5 μm, and the first super-hydrophobic layer is obtained after drying.

[0041] Wherein, the preparation method of super hydrophobic modified solution comprises the following steps: s1-1: Polylactic acid, nano-silicon dioxide, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:5:2:0.3 to obtain a hydrophobic mixture.

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

[0043] Step 2: Continue to spray the antibacterial modified solution on the first super-hydrophobic layer, with a coating thickness of 25 μm, and obtain an antibacterial layer after drying.

[0044] The method for preparing the antibacterial modified solution comprises the following steps: s2-1: chitosan and curcumin were mixed in a mass ratio of 2:1 to obtain an antibacterial mixture.

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

[0046] Step 3: Continue to spray the super-hydrophobic modified solution on the antibacterial layer, with a coating thickness of 5 μm. After drying, a second super-hydrophobic layer is obtained, that is, a super-hydrophobic filter material is obtained.

[0047] Example 3 A method for preparing a super-hydrophobic filter material, which is different from Example 1, comprises the following steps: Step 1: Take 100g / m 2 , a polyester needle-punched non-woven fabric with a thickness of 1.5 mm, a super-hydrophobic modification solution is sprayed on the non-woven fabric, the coating thickness is 8 μm, and the first super-hydrophobic layer is obtained after drying.

[0048] Wherein, the preparation method of super hydrophobic modified solution comprises the following steps: s1-1: Polylactic acid, nano-silicon dioxide, 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 super-hydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 12%.

[0050] Step 2: Continue to spray the antibacterial modified solution on the first super-hydrophobic layer, with a coating thickness of 27 μm, and obtain an antibacterial layer after drying.

[0051] The method for preparing the antibacterial modified solution comprises the following steps: s2-1: chitosan and curcumin were mixed in a mass ratio of 2:0.8 to obtain an antibacterial mixture.

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

[0053] Step 3: Continue to spray the super-hydrophobic modified solution on the antibacterial layer, with a coating thickness of 8 μm. After drying, a second super-hydrophobic layer is obtained, that is, a super-hydrophobic filter material is obtained.

[0054] Example 4 A method for preparing a super hydrophobic filter material, which is different from Example 1 in that: A method for preparing a super-hydrophobic filter material, which is different from Example 1 in that the method for preparing the antibacterial modified solution in step 2 comprises the following steps: s2-1: chitosan, curcumin and nano zinc oxide were mixed in a mass ratio of 2:1:0.5 to obtain an antibacterial mixture.

[0055] s2-2: Add N,N-dimethylformamide 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 super-hydrophobic filter material, which is different from Example 1 in that the method for preparing the antibacterial modified solution in step 2 comprises 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: Add N,N-dimethylformamide 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 super-hydrophobic filter material, which is different from Example 1 in that the method for preparing the antibacterial modified solution in step 2 comprises 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: Add N,N-dimethylformamide to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%.

[0060] Among them, 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 super-hydrophobic filter material, which is different from Example 1 in that the method for preparing the antibacterial modified solution in step 2 comprises 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: Add N,N-dimethylformamide 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 super-hydrophobic filter material, which is different from Example 1 in that in step 1, the method for preparing a super-hydrophobic modified solution comprises 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 super-hydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0065] Comparative Example 2 A method for preparing a super-hydrophobic filter material, which is different from Example 1 in that in step 1, the method for preparing a super-hydrophobic modified solution comprises the following steps: s1-1: Polylactic acid, nano-silicon dioxide, polypropylene glycol diglycidyl ether and sodium p-toluenesulfonate are mixed in a mass ratio of 10:1:1:0.1 to obtain a hydrophobic mixture.

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

[0067] Comparative Example 3 A method for preparing a super-hydrophobic filter material, which is different from Example 1 in that in step 1, the method for preparing a super-hydrophobic modified solution comprises the following steps: s1-1: Polylactic acid, nano-silicon dioxide, polyethylene glycol diglycidyl ether and sodium dodecylbenzene sulfonate 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 super-hydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 16%.

[0069] Performance Testing The filtration efficiency of the above-mentioned filter material was tested with reference to GB / T6719-2009. The oleophobic grade of the above-mentioned filter material was tested with reference to GB / T19977-2014. The hydrophobicity of the above-mentioned filter material was tested by a surface water contact angle experiment. The antibacterial rate of the above-mentioned filter material against Staphylococcus aureus and Escherichia coli was tested with reference to GB / T20944-2008. The surface resistivity of the above-mentioned filter material was tested with reference to GB / T 24249-2009. The above test results are shown in Table 1.

[0070] Table 1: It can be seen from the data in Table 1 that the filter materials of Examples 1 to 7 have good performance in terms of filtration efficiency, oleophobicity level, contact angle, antibacterial rate and surface resistivity. This shows that the super hydrophobic filter material provided by the present application has good comprehensive performance.

[0071] Specifically combined with the analysis of Example 1 and Comparative Examples 1-3, Comparative Example 1 replaces nano silicon dioxide with nano zinc oxide compared with Example 1, Comparative Example 2 replaces polyethylene glycol diglycidyl ether with polypropylene glycol diglycidyl ether compared with Example 1, and Comparative Example 3 replaces sodium p-toluenesulfonate with sodium dodecylbenzenesulfonate compared with Example 1. Example 1 has good comprehensive performance, which means that in the preparation process of super-hydrophobic filter material, the super-hydrophobic modified solution prepared by polylactic acid, nano silicon dioxide, polyethylene glycol diglycidyl ether and sodium p-toluenesulfonate can significantly improve the hydrophobicity and oleophobicity of the filter material, better improve its self-cleaning ability, and extend its service life.

[0072] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A super hydrophobic filter material, characterized in that: The super-hydrophobic filter material comprises a non-woven fabric, a super-hydrophobic layer, an antibacterial layer and a super-hydrophobic layer in sequence; The preparation method of the super-hydrophobic modified solution used for the super-hydrophobic layer comprises 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: adding a solvent to the hydrophobic mixture to prepare a super-hydrophobic modified solution, wherein the mass percentage concentration of the hydrophobic mixture is 8%-16%.

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

2.

3. A super hydrophobic filter material according to claim 1, characterized in that: The method for preparing the antibacterial modified solution used in the antibacterial layer comprises the following steps: s2-1: chitosan and curcumin are mixed in a mass ratio of 2:(0.5-1) to obtain an antibacterial mixture; s2-2: adding a solvent to prepare an antibacterial modified solution, wherein the mass percentage concentration of the antibacterial mixture is 15%-18%.

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

5. A super hydrophobic 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. A super hydrophobic filter material according to claim 1, characterized in that: The non-woven fabric is a polyester needle-punched non-woven fabric, and the specification of the polyester needle-punched non-woven fabric is 100g / m 2 .

7. A method for preparing a super hydrophobic filter material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Take a non-woven fabric, spray a super-hydrophobic modification solution on the non-woven fabric, and obtain a first super-hydrophobic layer after drying; Step 2: Continue to spray the antibacterial modified solution on the first super-hydrophobic layer, and obtain the antibacterial layer after drying; Step 3: Continue to spray the super-hydrophobic modified solution on the antibacterial layer, and obtain a second super-hydrophobic layer after drying, that is, a super-hydrophobic filter material.

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

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