A modified glass fiber filter material and a method for preparing the same

Abstract

The application discloses a modified glass fiber filter material and a preparation method thereof, adopts polydimethylsiloxane with good strength and strong adhesion as a low surface energy modifier, can reduce the surface energy of the glass fiber filter material, and improves the chemical hydrophobicity; and further uses silicon dioxide nanoparticles as a microstructure regulator, can realize effective cooperation of chemical hydrophobicity and structural hydrophobicity, and further improves the hydrophobic effect of the filter material; the modified preparation method is simple, easy to control, and low in requirement on equipment, and the prepared modified glass fiber filter material has good hydrophobicity and acid resistance, and simultaneously has excellent filtering performance, and can be widely produced and applied.

Description

Technical Field

[0001] This invention belongs to the field of materials technology, specifically relating to a modified glass fiber filter material and its preparation method. Background Technology

[0002] High-efficiency particulate air (HEPA) filters are a common method for treating various aerosols. Their core component is often glass fiber filter media. This type of inorganic material possesses high mechanical strength, strong heat resistance, and good corrosion resistance, and is widely used in air purification fields such as chemical production, medical and health care, mining development, and building ventilation. However, existing glass fiber filter media are prone to damage in high humidity and high acid environments, which not only hinders the continuous and stable operation of air purification processes but also increases operating costs. Summary of the Invention

[0003] In view of the above-mentioned technical problems existing in the prior art, the purpose of the present invention is to provide a glass fiber filter material with good filtration performance that can be used in high temperature, high humidity and high acid environment and its preparation method.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a modified glass fiber filter material, which is composed of original glass fiber filter material and a modifying agent, wherein the modifying agent is composed of polydimethylsiloxane precursor and silicon dioxide.

[0005] This invention also provides a method for preparing modified glass fiber filter material, comprising the following steps:

[0006] (1) The polydimethylsiloxane precursor and silica nanoparticles were dissolved and dispersed in an organic solvent and ultrasonically stirred to obtain a modified reagent.

[0007] (2) The original glass fiber filter material is immersed in the above-mentioned modifying agent, and after a certain period of time, it is taken out and air-dried naturally.

[0008] (3) Place the dried filter material in an oven and heat it under certain temperature conditions to obtain hydrophobic modified glass fiber filter material products.

[0009] Furthermore, in step (1), the mass concentration of the polydimethylsiloxane precursor in the organic solvent is 0.1% to 6.5%.

[0010] Furthermore, in step (1), the polydimethylsiloxane precursor is composed of a polydimethylsiloxane prepolymer and a curing agent.

[0011] Furthermore, in step (1), the particle size of the silica nanoparticles is 1-100 nm, and the mass concentration in the organic solvent is 0%-3.5%.

[0012] Further, in step (1), the organic solvent is one or more of petroleum ether, cyclohexane, isooctane, toluene, and xylene.

[0013] Furthermore, in step (2), the impregnation modification time is 0.1 to 15 minutes.

[0014] Furthermore, in step (3), the heating and curing temperature is 70–200°C, and the time is 5–300 min.

[0015] The beneficial effects of adopting the technical solution of this invention are as follows: This invention uses polydimethylsiloxane, which has good strength and strong adhesion, as a low surface performance modifier, which can reduce the surface energy of glass fiber filter material and improve chemical hydrophobicity; at the same time, it utilizes silica nanoparticles as microstructure regulators, which combine with polydimethylsiloxane to form a modifying agent, achieving effective synergy between chemical hydrophobicity and structural hydrophobicity, effectively improving the hydrophobic effect of the original filter material; the modification preparation method of this invention is simple, easy to control, and has low equipment requirements; the prepared modified glass fiber filter material has good hydrophobicity, acid resistance, high temperature resistance, and is not easily damaged, while also possessing excellent filtration performance, and can be widely produced and applied. Attached Figure Description

[0016] Figure 1 The contact angles are those of the modified glass fiber filter media prepared by the methods in Examples 2 to 6 of this invention.

[0017] Figure 2 The filtration efficiency of the modified glass fiber filter material prepared by the method in Examples 2 to 4 of this invention and the original glass fiber filter material under different conditions;

[0018] Figure 3 The contact angle changes of the modified glass fiber filter material prepared by methods two to four in embodiments of the present invention after impregnation in dilute nitric acid;

[0019] Figure 4 The appearance changes of the original filter material and the modified glass fiber filter material prepared by the method of Example 3 of this invention after being impregnated in dilute nitric acid. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] This invention provides a modified glass fiber filter material, composed of original glass fiber filter material and a modifying agent, wherein the modifying agent consists of a polydimethylsiloxane precursor and silica. The precursor and silica can form a chemically hydrophobic network and a physically hydrophobic microstructure under certain conditions.

[0023] Preferably, embodiments of the present invention also provide a method for preparing modified glass fiber filter material, comprising the following steps:

[0024] (1) The polydimethylsiloxane precursor and silica nanoparticles were dissolved and dispersed in an organic solvent and ultrasonically stirred to obtain a modified reagent.

[0025] (2) The original glass fiber filter material is immersed in the above-mentioned modifying agent, and after a certain period of time, it is taken out and air-dried naturally.

[0026] (3) Place the dried filter material in an oven and heat it under certain temperature conditions to obtain modified glass fiber filter material.

[0027] Preferably, in step (1), the mass concentration of the polydimethylsiloxane precursor in the organic solvent is 0.1% to 6.5%.

[0028] Preferably, in step (1), the polydimethylsiloxane precursor is composed of a polydimethylsiloxane prepolymer and a curing agent.

[0029] Preferably, in step (1), the silica nanoparticles have a particle size of 1 to 100 nm and a mass concentration of 0% to 3.5% in the organic solvent.

[0030] Preferably, in step (1), the organic solvent is one or more of petroleum ether, cyclohexane, isooctane, toluene, and xylene.

[0031] Preferably, in step (2), the impregnation modification time is 0.1 to 15 min.

[0032] Preferably, in step (3), the heating and curing temperature is 70-200℃ and the time is 5-300 min.

[0033] Example 2

[0034] Modified glass fiber filter material was prepared using the method described in Example 1 of this invention. 0.5g of polydimethylsiloxane prepolymer and 0.05g of curing agent were accurately weighed into a screw-top bottle. Then, 100g of toluene was added to the bottle, and the mixture was ultrasonically stirred to obtain a modifying agent. The original glass fiber filter material was completely immersed in the above-mentioned modifying agent, and after 3 minutes, it was removed and allowed to air dry naturally. The dried glass fiber filter material was placed in an environment of 120°C and continuously heated and cured for 2.0 hours to obtain the modified glass fiber filter material GF-P.

[0035] Example 3

[0036] Modified glass fiber filter material was prepared using the method described in Example 1 of this invention. 1.0 g of polydimethylsiloxane prepolymer and 0.10 g of curing agent were accurately weighed into a screw-top bottle, followed by the addition of 0.50 g of silica nanoparticles. Finally, 100.0 g of toluene was added to the bottle, and the mixture was ultrasonically stirred to obtain a modifying agent. The original glass fiber filter material was completely immersed in the above-mentioned modifying agent, and after 2 minutes, it was removed and allowed to air dry naturally. The dried glass fiber filter material was placed in an environment of 130°C and continuously heated and cured for 1.5 hours to obtain the modified glass fiber filter material GF-PS-0.5.

[0037] Example 4

[0038] Modified glass fiber filter material was prepared using the method described in Example 1 of this invention. 1.0 g of polydimethylsiloxane prepolymer and 0.10 g of curing agent were accurately weighed into a screw-top bottle, followed by the addition of 1.0 g of silica nanoparticles. Finally, 100.0 g of toluene was added to the bottle, and the mixture was ultrasonically stirred to obtain a modifying agent. The original glass fiber filter material was completely immersed in the above-mentioned modifying agent, and after 2 minutes, it was removed and allowed to air dry naturally. The dried glass fiber filter material was placed in an environment of 130°C and continuously heated and cured for 2.0 h to obtain the modified glass fiber filter material GF-PS-1.0.

[0039] Example 5

[0040] Modified glass fiber filter material was prepared using the method described in Example 1 of this invention. 1.0 g of polydimethylsiloxane prepolymer and 0.10 g of curing agent were accurately weighed into a screw-top bottle, followed by the addition of 1.5 g of silica nanoparticles. Finally, 100.0 g of cyclohexane was added to the bottle, and the mixture was ultrasonically stirred to obtain a modifying agent. The original glass fiber filter material was completely immersed in the above-mentioned modifying agent, and after 1 minute, it was removed and allowed to air dry naturally. The dried glass fiber filter material was placed in an environment of 110°C and continuously heated and cured for 3.0 h to obtain the modified glass fiber filter material GF-PS-1.5.

[0041] Example 6

[0042] Modified glass fiber filter material was prepared using the method described in Example 1 of this invention. 1.5g of polydimethylsiloxane prepolymer and 0.15g of curing agent were accurately weighed into a screw-top bottle, followed by the addition of 2.0g of silica nanoparticles. Finally, 100.0g of isooctane was added to the bottle, and the mixture was ultrasonically stirred to obtain a modifying agent. The original glass fiber filter material was completely immersed in the above-mentioned modifying agent, and after 5 minutes, it was removed and allowed to air dry naturally. The dried glass fiber filter material was placed in an environment of 120°C and continuously heated and cured for 2.0 hours to obtain the modified glass fiber filter material GF-PS-2.0.

[0043] See attached document Figure 1When the SiO2 content increased from 0 to 0.5%, 1.0% and 1.5%, the contact angle of the modified glass fiber filter material prepared in the embodiments of the present invention gradually increased to 150.7°, 152.7° and 154.9°, respectively, indicating that the introduction of SiO2 nanoparticles significantly increased the surface roughness, which is beneficial to improving the contact angle of the fiber filter material.

[0044] See attached document Figure 2 The modified glass fiber filter media prepared in the embodiments of the present invention exhibit filtration efficiencies exceeding 99.997% under different humidity conditions, meeting the filtration requirements of nuclear-grade filter media (>99.99%). Furthermore, the filtration efficiency of the series of filter media does not show a significant variation under various conditions, indicating that the filtration effect of the series of filter media is relatively stable under all conditions.

[0045] See attached document Figure 3 GF-P initially exhibited superhydrophobic properties before impregnation, but its static contact angle decreased with increasing impregnation time. For both GF-PS-0.5 and GF-PS-1.0, their static contact angles exceeded those of GF-P, both initially and during a week-long impregnation test, and they maintained their superhydrophobic state throughout. This indicates that the modified glass fiber filter material prepared according to the embodiments of this invention exhibits long-lasting hydrophobic properties.

[0046] See attached document Figure 4 The images show two filter media, GF-0 and GF-PS-0.5, immersed in dilute nitric acid. After prolonged immersion, GF-0 exhibited significant bending and breakage, while the modified GF-PS-0.5 showed no obvious changes in appearance and maintained structural stability in dilute nitric acid. This indicates that the modified glass fiber filter media of this invention has good acid resistance.

[0047] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention is also intended to include these modifications and variations.

Claims

1. A modified glass fiber filter material, characterized in that, It consists of raw glass fiber filter material and a modifying agent, wherein the modifying agent is composed of polydimethylsiloxane precursor and silicon dioxide; The method for preparing a modified glass fiber filter material includes the following steps: (1) The polydimethylsiloxane precursor and silica nanoparticles were dissolved and dispersed in an organic solvent and ultrasonically stirred to obtain a modified reagent. (2) The original glass fiber filter material is immersed in the above-mentioned modifying agent, and after a certain period of time, it is taken out and air-dried naturally; (3) Place the dried filter material in an oven and heat it under certain temperature conditions to obtain hydrophobic modified glass fiber filter material products; In step (1), the polydimethylsiloxane precursor is composed of polydimethylsiloxane prepolymer and curing agent.

2. The method for preparing a modified glass fiber filter material according to claim 1, characterized in that, Includes the following steps: (1) The polydimethylsiloxane precursor and silica nanoparticles were dissolved and dispersed in an organic solvent and ultrasonically stirred to obtain a modified reagent. (2) The original glass fiber filter material is immersed in the above-mentioned modifying agent, and after a certain period of time, it is taken out and air-dried naturally; (3) Place the dried filter material in an oven and heat it under certain temperature conditions to obtain hydrophobic modified glass fiber filter material products.

3. The method for preparing a modified glass fiber filter material according to claim 1, characterized in that, In step (1), the mass concentration of the polydimethylsiloxane precursor in the organic solvent is 0.1% to 6.5%.

4. The method for preparing a modified glass fiber filter material according to claim 1, characterized in that, In step (1), the particle size of the silica nanoparticles is 1~100 nm, and the mass concentration in the organic solvent is 0%~3.5%, and not 0.

5. The method for preparing a modified glass fiber filter material according to claim 1, characterized in that, In step (1), the organic solvent is one or more of petroleum ether, cyclohexane, isooctane, toluene, and xylene.

6. The method for preparing a modified glass fiber filter material according to claim 1, characterized in that, In step (2), the impregnation modification time is 0.1~15 min.

7. The method for preparing a modified glass fiber filter material according to claim 1, characterized in that, In step (3), the heating and curing temperature is 70~200℃ and the time is 5~300 min.

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