Antibacterial glass fiber mat filter material and preparation method thereof

Abstract

The invention relates to an antibacterial glass fiber mat filter material and a preparation method thereof. The preparation method comprises the following steps: 1) respectively cleaning a glass fiber filter membrane with water and ethanol, and drying; 2) uniformly spraying the antibacterial treatment liquid to the surface of the glass fiber filtering membrane by a spraying device until the glass fiber filtering membrane is completely soaked in the antibacterial treatment liquid; (3) carrying out heat preservation and heat treatment on the sprayed glass fiber filter membranes at 110-130 DEG C for 90-150 minutes, cleaning and drying, and (4) stacking the glass fiber filter membranes, adding polyester separation layers among the filter membranes, and then integrally hot-pressing to form a felt, thereby obtaining the antibacterial glass fiber mat filter material.

Description

Technical Field

[0001] The invention relates to a glass fiber filter material, in particular to a glass fiber filter material with antibacterial function. Background Art

[0002] Glass fiber can be made into filter materials such as filter membranes because of its flame retardancy, corrosion resistance, low water absorption and high strength. It is particularly suitable for filtering food, medicine and drinking water. However, since glass fiber itself does not have antibacterial properties, it is easy to breed bacteria after long-term use. Chinese patent CN201910404580.3 discloses an antibacterial glass fiber membrane, which uses glass fiber to couple organosilicon quaternary ammonium salt to make the glass fiber membrane have an inhibition rate against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). However, in further research, we found that the existing antibacterial glass fiber filter membrane has a poor inhibition rate against fungi and molds, and the filter membrane has low strength, making it difficult to be used in occasions such as filtration with large pressure differences. Based on this, providing a glass fiber filter material that can inhibit various microorganisms including fungi and molds has become an urgent problem to be solved in the prior art. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a new antibacterial glass fiber thin felt filter material. By optimizing the ratio of the antibacterial material, a glass fiber filter membrane with good antibacterial effect on Gram-negative bacteria, Gram-positive bacteria, fungi and molds is obtained, and on this basis, it is pressed into a thin felt filter material.

[0004] The technical solution adopted by the present invention is: to provide an antibacterial glass fiber felt filter material, and the preparation method of the antibacterial glass fiber felt filter material comprises the following steps: 1) The glass fiber filter membrane is washed with water and ethanol respectively and then dried; after drying, it is placed in an oven and heat treated at 100-150°C for at least 10 minutes; 2) Using a spray device, spray the antibacterial treatment liquid evenly onto the surface of the glass fiber filter membrane until the glass fiber filter membrane is completely soaked in the antibacterial treatment liquid, wherein the antibacterial liquid comprises the following components by mass fraction: 2% to 3% of a coupling agent, 1.5% to 2.5% of an organosilicon quaternary ammonium salt, 8% to 10% of pure water, and the remainder of an organic solvent; the organosilicon quaternary ammonium salt is dimethyloctadecyl [3-(trimethoxysilyl)propyl] ammonium chloride and (trimethylsilylpropyl) hexyl dimethyl ammonium chloride in a mass ratio of 1:0.8 to 1.2; 3) heat-treating the glass fiber filter membrane after spraying in step 2) at 110-130° C. for 90-150 minutes, and then washing and drying to obtain an antibacterial glass fiber filter membrane; 4) The antibacterial glass fiber filter membranes obtained in step 3) are stacked, a polyester separator layer is added between the filter membranes, and then the whole is hot pressed into a felt to obtain the antibacterial glass fiber thin felt filter material.

[0005] The antibacterial glass fiber felt filter material described above, further, the heat treatment temperature in step 1) is 130°C~150°C, the heat treatment time is 60min~120min, and the hot pressing temperature in step 4) is 130°C~150°C; the thickness of the antibacterial glass fiber felt filter material is 0.5~5mm, and the polyester separator layer is a polyester non-woven fabric.

[0006] The antibacterial glass fiber felt filter material further comprises a coupling agent of ethyl orthosilicate and an organic solvent of ethanol.

[0007] The present invention also provides a method for preparing the antibacterial glass fiber felt filter material, comprising the following steps: 1) The glass fiber filter membrane is washed with water and ethanol respectively and then dried; after drying, it is placed in an oven for heat treatment at 130-150°C for 60-120 minutes; 2) Using a spray device, spray the antibacterial treatment liquid uniformly onto the surface of the glass fiber filter membrane until the glass fiber filter membrane is completely soaked in the antibacterial treatment liquid, wherein the antibacterial liquid comprises the following components by mass fraction: 2% to 3% of a coupling agent, 1.5% to 2.5% of a quaternary ammonium salt of organic silicon, 8% to 10% of pure water, and the remainder of an organic solvent; the quaternary ammonium salt of organic silicon is dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (trimethylsilylpropyl)hexyldimethylammonium chloride in a mass ratio of 1:0.8 to 1.2, the coupling agent is ethyl orthosilicate, and the organic solvent is ethanol; 3) heat-treating the glass fiber filter membrane after spraying in step 2) at 110-130° C. for 90-150 minutes, and then washing and drying to obtain an antibacterial glass fiber filter membrane; 4) The antibacterial glass fiber filter membranes obtained in step 3) are stacked, a polyester separator layer is added between the filter membranes, and then the whole is hot pressed into a felt to obtain the antibacterial glass fiber thin felt filter material.

[0008] The antibacterial glass fiber thin felt filter material provided by the present invention is based on an antibacterial glass fiber filter membrane. By optimizing the ratio of organic silicon quaternary ammonium salt, it is unexpectedly found that when a specific ratio of dimethyloctadecyl [3-(trimethoxysilyl)propyl] ammonium chloride and (trimethylsilylpropyl)hexyldimethylammonium chloride is used, the obtained antibacterial glass fiber filter membrane can have a strong antibacterial rate against Staphylococcus aureus (Gram-positive), Escherichia coli (Gram-negative) as well as fungi and molds, and its antibacterial effect is better than any comparative example of a single antibacterial active ingredient. On this basis, after it is hot-pressed into a felt, its application range is wider and it can be used in applications with a larger pressure difference. DETAILED DESCRIPTION

[0009] In order to make the present invention clearer and more specific, the technical solution of the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0010] The present invention provides an antibacterial glass fiber felt filter material, and the preparation method comprises the following steps: 1) The glass fiber filter membrane was washed with water and ethanol respectively, and then dried in an oven at 120°C for 30 minutes; after drying, it was placed in an oven at 150°C for 60 minutes; 2) Using a spray device, spray the antibacterial treatment liquid evenly onto the surface of the glass fiber filter membrane until the glass fiber filter membrane is completely soaked in the antibacterial treatment liquid, wherein the antibacterial liquid comprises the following components by mass fraction: 3% of ethyl orthosilicate as a coupling agent, 2% of organosilicon quaternary ammonium salt, 8% of pure water, and the balance of ethanol; 3) heat-treating the glass fiber filter membrane after spraying in step 2) at 120-130° C. for 120 min, then washing with water and ethanol respectively, and drying to obtain an antibacterial glass fiber filter membrane; 4) stacking the antibacterial glass fiber filter membranes obtained in step 3), adding polyester separators between the filter membranes, and then hot pressing the whole at 130° C. to 150° C. to form a felt, thereby obtaining the antibacterial glass fiber thin felt filter material.

[0011] The compositions of the organosilicon quaternary ammonium salts of the embodiments and comparative examples are shown in the table below:

[0012] The plate count method was used to detect the antibacterial rates (%) of the glass fiber filter membranes prepared in the examples and comparative examples against Escherichia coli, Staphylococcus aureus, Candida albicans and Aspergillus niger. The results are shown in the following table

[0013] The test results show that the glass fiber filter membrane of the embodiment has excellent antibacterial effect on the four types of fungi, and is higher than the two comparative examples, indicating that the organosilicon quaternary ammonium salt combination used in the present invention can improve the antibacterial effect of the filter membrane.

Claims

1. An antibacterial glass fiber felt filter material, characterized in that The preparation method of the antibacterial glass fiber felt filter material comprises the following steps: 1): The glass fiber filter membrane is cleaned with water and ethanol respectively and then dried; after drying, it is placed in an oven and heat treated at 100-150°C for at least 10 minutes; 2) Using a spray device, spray the antibacterial treatment liquid evenly onto the surface of the glass fiber filter membrane until the glass fiber filter membrane is completely soaked in the antibacterial treatment liquid, wherein the antibacterial liquid comprises the following components by mass fraction: 2% to 3% of a coupling agent, 1.5% to 2.5% of an organosilicon quaternary ammonium salt, 8% to 10% of pure water, and the remainder of an organic solvent; the organosilicon quaternary ammonium salt is dimethyloctadecyl [3-(trimethoxysilyl)propyl] ammonium chloride and (trimethylsilylpropyl) hexyl dimethyl ammonium chloride in a mass ratio of 1:0.8 to 1.2; 3) heat-treating the glass fiber filter membrane after spraying in step 2) at 110-130° C. for 90-150 minutes, and then washing and drying to obtain an antibacterial glass fiber filter membrane; 4) The antibacterial glass fiber filter membranes obtained in step 3) are stacked, a polyester separator layer is added between the filter membranes, and then the whole is hot pressed into a felt to obtain the antibacterial glass fiber thin felt filter material.

2. The antibacterial glass fiber felt filter material according to claim 1, characterized in that: In step 1), the heat treatment temperature is 130°C to 150°C, and the heat treatment time is 60min to 120min; in step 4), the hot pressing temperature is 130°C to 150°C; the thickness of the antibacterial glass fiber felt filter material is 0.5 to 5mm, and the polyester separator layer is a polyester non-woven fabric.

3. The antibacterial glass fiber felt filter material according to claim 2, characterized in that The coupling agent is tetraethyl orthosilicate and the organic solvent is ethanol.

4. A method for preparing an antibacterial glass fiber felt filter material, characterized in that The following steps are involved: 1): The glass fiber filter membrane is cleaned with water and ethanol respectively and then dried; after drying, it is placed in an oven for heat treatment at 130~150℃ for 60min~120min; 2) Using a spray device, spray the antibacterial treatment liquid uniformly onto the surface of the glass fiber filter membrane until the glass fiber filter membrane is completely soaked in the antibacterial treatment liquid, wherein the antibacterial liquid comprises the following components by mass fraction: 2% to 3% of a coupling agent, 1.5% to 2.5% of a quaternary ammonium salt of organic silicon, 8% to 10% of pure water, and the remainder of an organic solvent; the quaternary ammonium salt of organic silicon is dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (trimethylsilylpropyl)hexyldimethylammonium chloride in a mass ratio of 1:0.8 to 1.2, the coupling agent is ethyl orthosilicate, and the organic solvent is ethanol; 3) heat-treating the glass fiber filter membrane after spraying in step 2) at 110-130° C. for 90-150 minutes, and then washing and drying to obtain an antibacterial glass fiber filter membrane; 4) The antibacterial glass fiber filter membranes obtained in step 3) are stacked, a polyester separator layer is added between the filter membranes, and then the whole is hot pressed into a felt to obtain the antibacterial glass fiber thin felt filter material.

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