Method for manufacturing a papermaking felt and papermaking felt

Abstract

The application discloses a papermaking felt preparation method and a papermaking felt. The method comprises the following steps: providing a papermaking felt body and an anti-fouling treatment agent; and processing the papermaking felt body through the anti-fouling treatment agent and a plasma machine to obtain the papermaking felt. The anti-fouling treatment agent is prepared from polydimethylsiloxane, a coupling agent, butyl acetate, an alcohol solvent and modified nanoparticles. In this way, the papermaking felt with good anti-fouling performance and water filtering performance can be obtained.

Description

TECHNICAL FIELD

[0001] The application relates to the papermaking technical field, in particular to a papermaking felt preparation method and papermaking felt. BACKGROUND

[0002] The papermaking felt is a necessary dewatering device in the production process of a papermaking machine, and plays a role in transferring a wet paper sheet, leveling a paper sheet surface and dewatering. The quality of the papermaking felt has a direct relationship with the quality of produced paper, the production efficiency of the papermaking machine and the consumption of energy and the like. In the use process of the papermaking felt, the filterability of the papermaking felt is often deteriorated to the extent that the production cannot be maintained and the papermaking felt is taken off in advance due to reasons such as serious contamination, pore blockage and hardening. Therefore, the anti-pollution modification of the papermaking felt is very important in the papermaking process.

[0003] The existing scheme improves the anti-pollution performance of the papermaking felt after the anti-pollution modification of the papermaking felt, but also seriously affects the filterability of the papermaking felt. Therefore, it is an urgent matter to provide a papermaking felt with good anti-pollution performance and filterability. SUMMARY

[0004] The technical problem solved by the application is to provide a papermaking felt preparation method and papermaking felt, so that a papermaking felt with good anti-pollution performance and filterability can be obtained.

[0005] To solve the above technical problem, the first aspect of the application provides a papermaking felt preparation method, which comprises the following steps: providing a papermaking felt body and an anti-pollution treatment agent; treating the papermaking felt body with the anti-pollution treatment agent and a plasma machine to obtain a papermaking felt; wherein the anti-pollution treatment agent is prepared from polydimethylsiloxane, a coupling agent, butyl acetate, an alcohol solvent and modified nanoparticles.

[0006] The alcohol solvent comprises one or more of methanol, ethanol, butanol, propanol and isopropanol; and / or the coupling agent is one or a mixture of two of a methoxysilane coupling agent and an ethoxysilane coupling agent of a long-chain alkane; wherein the chain length of the long-chain alkane is 6-15.

[0007] The alcohol solvent is propanol; and the ratio of the polydimethylsiloxane, the coupling agent, the butyl acetate and the propanol is (0.1-0.8):(0.1-0.3):(1:1.4):1.

[0008] The modified nanoparticles are obtained by modifying nanometer oxides.

[0009] The step of modifying the nano-oxide includes: dispersing the nano-oxide in an alcohol solvent to obtain a dispersion solution; adding a coupling agent and an acid solution into the dispersion solution, mixing uniformly, and stirring and reacting at room temperature to obtain a modified solution; and sequentially performing centrifugation and drying treatment on the modified solution to obtain modified nanoparticles.

[0010] The dispersing the nano-oxide in the alcohol solvent includes: ultrasonically dispersing the nano-oxide in anhydrous ethanol, the ultrasonic time being 15-30 min and the ultrasonic temperature being 35-55℃.

[0011] The adding the coupling agent and the acid solution into the dispersion solution and mixing uniformly includes: after adding the coupling agent and the acid solution into the dispersion solution, ultrasonic treatment is performed for 5-10 min.

[0012] The acid solution includes formic acid, sulfurous acid and benzoic acid hydrogen sulfonic acid; the stirring time is 2-6 h; the centrifugation time is 5-15 min; and the drying temperature is 60-80℃.

[0013] The nano-oxide includes at least one of nano-alumina, nano-titanium oxide, nano-zinc oxide and nano-silicon oxide.

[0014] The papermaking felt body is treated by the anti-fouling treatment agent and the plasma machine to obtain the papermaking felt, including: immersing the papermaking felt body in the anti-fouling treatment agent, adopting a padding process, reacting at 80-180℃, and then performing plasma machine treatment to obtain the papermaking felt.

[0015] The plasma machine treatment time is 3-15 min, the treatment power is 300-1500 W, and the treatment atmosphere is oxygen.

[0016] To solve the above technical problems, the second aspect of the present application provides a papermaking felt, which is the papermaking felt obtained by the first aspect.

[0017] The present application has the following beneficial effects: different from the prior art, the present application provides a papermaking felt body and an anti-fouling treatment agent; the papermaking felt body is treated by the anti-fouling treatment agent and a plasma machine to obtain a papermaking felt; the anti-fouling treatment agent is prepared from polydimethylsiloxane, a coupling agent, butyl acetate, an alcohol solvent and modified nanoparticles. The papermaking felt body is treated by the anti-fouling treatment agent, so that the obtained papermaking felt has good anti-fouling performance to effectively resist fouling; and then the papermaking felt is treated by the plasma machine, so that part of the hydrophobic groups on the surface of the papermaking felt become hydrophilic groups, so that the papermaking felt has good water filtration performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1is a flow chart of an embodiment of the papermaking felt preparation method provided by the present application;

[0019] Figure 2 is a schematic diagram of the coupling agent and nanoparticle reaction process;

[0020] Figure 3 is a schematic diagram of the papermaking felt impregnation process;

[0021] Figure 4 is a schematic diagram of the plasma machine treatment process;

[0022] Figure 5 is a surface electron microscope image of the papermaking felt body;

[0023] Figure 6 is a surface electron microscope image of an embodiment of the papermaking felt;

[0024] Figure 7 is a contact angle data diagram of an embodiment of the papermaking felt and the papermaking felt body;

[0025] Figure 8 is a surface electron microscope image of the papermaking felt produced using the prior art after 20 times of stain resistance;

[0026] Figure 9 is a surface electron microscope image of the papermaking felt produced using the papermaking felt preparation method of the present application after 20 times of stain resistance;

[0027] Figure 10 is a surface electron microscope image of another embodiment of the papermaking felt;

[0028] Figure 11 is a contact angle diagram of another embodiment of the papermaking felt and the papermaking felt body. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] It should be noted that the description of “first”, “second”, etc. in the embodiments of the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with “first”, “second” can explicitly or implicitly include at least one of the features.

[0031] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0032] Reference is made to Figures 1-4 , Figure 1 is a flowchart of an embodiment of the method for preparing a papermaking felt provided by the present application, Figure 2 is a schematic diagram of the reaction process of the coupling agent and the nanoparticles, Figure 3 is a schematic diagram of the impregnation process of the papermaking felt; Figure 4 is a schematic diagram of the treatment process of the plasma machine; the method for preparing a papermaking felt comprises:

[0033] S11: providing a papermaking felt body and an anti-fouling treatment agent.

[0034] In an embodiment, the papermaking felt body can comprise one layer or multiple layers, and the anti-fouling treatment and the plasma machine treatment can be selectively performed on a certain layer of the papermaking felt body, such as the surface layer of the papermaking felt body; or the anti-fouling treatment and the plasma machine treatment can be performed on the papermaking felt body.

[0035] The anti-fouling treatment agent is prepared from polydimethylsiloxane, a coupling agent, butyl acetate, an alcohol solvent, and modified nanoparticles. Specifically, the polydimethylsiloxane, the coupling agent, the butyl acetate, and the alcohol solvent are mixed in a certain proportion, and then the modified nanoparticles are added and uniformly dispersed, to obtain the anti-fouling treatment agent. In an embodiment, the alcohol solvent can comprise one or more of methanol, butanol, propanol, and isopropanol, i.e., the alcohol solvent can be a mixed solvent obtained by mixing multiple solvents; the coupling agent is one or a mixture of both of a methoxysilane coupling agent and an ethoxysilane coupling agent of long-chain alkane; wherein the chain length of the long-chain alkane is 6-15. In a specific embodiment, the alcohol solvent is propanol, and the proportions of polydimethylsiloxane, the coupling agent, butyl acetate, and propanol are (0.1-0.8):(0.1-0.3):(1:1.4):1.

[0036] The modified nanoparticles can be nano-oxides, which can comprise at least one of nano-aluminum oxide, nano-titanium oxide, and nano-zinc oxide; or the modified nanoparticles can be nano-gold, nano-silver, etc., which are not specifically limited here.

[0037] The nanoparticles are modified to obtain modified nanoparticles. Specifically, the nano-oxide is dispersed in an alcohol solvent to obtain a dispersion solution; in an embodiment, the alcohol solvent can be anhydrous ethanol, and in other embodiments, it can also be methanol or other alcohol solvents; the nano-oxide can be dispersed in anhydrous ethanol by ultrasonic method, and the ultrasonic time can be 15-30 min, and the ultrasonic temperature is 35-55°C. After adding a coupling agent and an acid solution into the dispersion solution and mixing uniformly, the mixture is stirred and reacted at room temperature to obtain a modified solution; in an embodiment, the acid solution can be one or more of formic acid, acetic acid, sulfurous acid, benzoic acid, and hydrogen sulfonic acid; in a specific embodiment, the acid solution is acetic acid, and a proper amount of coupling agent and acetic acid are added into the dispersion solution and ultrasonically treated for 5-10 min, so that the pH of the solution after ultrasonic treatment is between 2 and 7, and the coupling agent and the nanoparticles are allowed to react at room temperature for 2-6 hours to obtain the modified solution. The reaction process of the coupling agent and the nanoparticles is shown in Figure 2 ; the coupling agent is hydrolyzed to obtain a hydrolysis product, and the hydrolysis product is condensed with the hydrophilic groups on the surface of the nanoparticles to obtain the modified nanoparticles. The modified solution is sequentially subjected to centrifugation and drying treatment to obtain the modified nanoparticles. In an embodiment, the centrifugation time is 5-15 min, and the drying temperature is 60-80°C. The ratio of the nanoparticles to the modified solution is 1%-30%, and the ratio of the coupling agent to acetic acid and ethanol is (0.1-0.5):(0.9-1.4):1.

[0038] S12: The papermaking felt body is treated with the anti-staining agent and the plasma machine to obtain a papermaking felt.

[0039] In an embodiment, after obtaining the anti-staining agent, the papermaking felt body is immersed in the anti-staining agent, and a padding process is adopted, and then the temperature is increased to 80-180°C for reaction, and then the plasma machine is used for treatment to obtain the papermaking felt. In the process of preparing the anti-staining agent, the polydimethylsiloxane, the coupling agent, and the nanoparticles are not fully reacted or not reacted, so in the dipping process, the temperature is increased (i.e., 80-180°C) to accelerate the reaction between the polydimethylsiloxane, the coupling agent, and the nanoparticles, so that the substances obtained after the reaction are deposited on the surface of the papermaking felt body to make the papermaking felt effectively anti-staining; and increasing the temperature can also evaporate the excess water in the anti-staining agent. In an embodiment, a two-dip-two-pad process can be used; it can be understood that in other embodiments, a one-dip-one-pad process can also be used. The process of dipping the papermaking felt is shown in Figure 3 ; the modified nanoparticles, the polydimethylsiloxane, and the coupling agent react on the surface of the papermaking felt body.

[0040] After the reaction at 80-180 °C, the papermaking felt is further treated by a plasma machine for 3-15 min at a power of 300-1500 W in an oxygen atmosphere. The treatment by the plasma machine can change part of the hydrophobic groups on the surface of the papermaking felt into hydrophilic groups, so that the papermaking felt has good hydrophobicity. The treatment process by the plasma machine is specifically shown in Figure 4

[0041] The papermaking felt body and the anti-fouling treatment agent are provided. The papermaking felt body is treated by the anti-fouling treatment agent and the plasma machine to obtain the papermaking felt. The anti-fouling treatment agent is prepared from polydimethylsiloxane, a coupling agent, butyl acetate, an alcohol solvent, and modified nanoparticles. The papermaking felt body is treated by the anti-fouling treatment agent, so that the obtained papermaking felt has good hydrophobicity to achieve anti-fouling. The papermaking felt is further treated by the plasma machine, so that part of the hydrophobic groups on the surface of the papermaking felt are changed into hydrophilic groups, so that the papermaking felt has good water filtration performance.

[0042] The polydimethylsiloxane is one of silicone materials, and the main chain Si-O bond has a special spiral structure, so that the intermolecular force is small, the bond energy is large, the low surface energy is given, and the methyl on the outside of the main chain can rotate freely, and excellent anti-pollution performance is achieved. The anti-fouling treatment agent prepared by dipping the papermaking felt body into the polydimethylsiloxane can construct a hydrophobic surface layer on the surface of the papermaking felt body to achieve good anti-fouling. However, the construction of the hydrophobic surface layer reduces the water filtration performance of the papermaking felt. Further treatment by oxygen plasma breaks part of the methyl on the surface of the siloxane, increases the hydrophilic group hydroxyl on the surface, and controls the conditions, so that the surface of the papermaking felt has certain hydrophilic segments and certain hydrophobic segments, so that the papermaking felt has excellent anti-fouling performance and excellent water filtration performance.

[0043] To facilitate the description of the performance of the papermaking felt obtained by the present application, a specific papermaking felt preparation method and related test data are provided. Specifically, nanosilica is selected as the nano-oxide, and dodecyltrimethoxysilane is selected as the coupling agent. The nanosilica is ultrasonically dispersed in anhydrous ethanol for 15 min at a temperature of 55 °C. Then, an appropriate amount of dodecyltrimethoxysilane and acetic acid are added and ultrasonically treated for 10 min. After uniform mixing, the mixture is stirred at room temperature for 2 h to obtain a modified solution. The modified solution is centrifuged for 10 min to obtain a precipitate, which is dried in a vacuum oven at 80 °C for 60 min to obtain modified nanoparticles. The ratio of nanosilica to the modified solution is 2%, and the ratio of dodecyltrimethoxysilane to acetic acid and ethanol is 0.2:1:1.

[0044] ​Polydimethylsiloxane, dodecyltrimethoxysilane, butyl acetate and propanol were mixed evenly in a ratio of 0.5:0.1:1.4:1, and then modified nanoparticles were added at a concentration of 5% to obtain an antifouling agent.

[0045] The papermaking felt body or a layer thereof is immersed in an antifouling agent using a two-dip, two-roll process. A hot air high-temperature reaction is conducted at 120°C, followed by plasma treatment for 3 minutes at a power of 1200W in an oxygen atmosphere, resulting in a hydrophilic-hydrophobic multifunctional durable antifouling papermaking felt. The obtained papermaking felt and the papermaking felt body are then subjected to electron microscopy and contact angle measurements. Figures 5-7 As shown, Figure 5 This is an electron microscope image of the surface of the papermaking felt. Figure 6 This is a surface electron microscope image of one embodiment of papermaking felt. Figure 7 This is a diagram showing the contact angle data of one embodiment of the papermaking felt and the papermaking felt body. (Example) Figure 5 The surface of the papermaking felt is smooth; such as Figure 6 As shown, the surface of the papermaking felt is relatively rough, indicating that the surface of the papermaking felt has been successfully modified using the preparation method of this application. Figure 7 It can be seen that the contact angle of the papermaking felt body is around 100° between 0 and 10 seconds, indicating strong hydrophobicity and poor water filtration performance. The contact angle of the papermaking felt from 0 to 8 seconds is roughly the same as that of the felt body, but from the 8th second onwards, the contact angle decreases significantly, indicating good hydrophobicity and water filtration performance. The significant decrease in contact angle from the 8th second onwards is due to the time required for the papermaking felt to become wetted. If the groups on the surface of the papermaking felt were all hydrophilic, the contact angle should be around 20° from 0 seconds; if the groups on the surface of the papermaking felt were all hydrophobic, the contact angle should remain around 100°. Therefore, from... Figure 7 It can also be seen that some of the groups on the surface of the papermaking felt are hydrophilic groups and some are hydrophobic groups, which can well explain why the papermaking felt has good hydrophobicity and water filtration properties.

[0046] Furthermore, the papermaking felt provided in this application can be used more times than existing papermaking felts. For example... Figure 8 and Figure 9 As shown, Figure 8 These are electron microscope images of the surface of papermaking felt produced using existing technology after 20 anti-fouling treatments. Figure 9The surface electron microscope graph of the papermaking felt prepared by the papermaking felt preparation method of the application after 20 times of anti-pollution shows that the surface of the papermaking felt adheres a lot of dirt. The papermaking felt prepared by the papermaking felt preparation method of the application has less dirt on the surface after 20 times of anti-pollution. Therefore, the papermaking felt provided by the application can be used for a long time, and has good anti-pollution and water filtration properties compared with the papermaking felt produced by the prior art.

[0047] In another embodiment, nanometer titanium dioxide can also be selected as the nanometer oxide, and dodecyl trimethoxysilane can be selected as the coupling agent. The nanometer titanium dioxide is ultrasonically dispersed in anhydrous ethanol, the ultrasonic time is 30 min, and the temperature is 35°C. Then, a proper amount of dodecyl trimethoxysilane and acetic acid are added, and ultrasonic treatment is performed for 8 min. After the mixture is uniformly mixed, stirring reaction is performed at room temperature for 4 h to obtain a modified solution. Centrifugation is performed for 15 min by using a centrifuge to obtain a precipitate. The modified nanoparticles are obtained by drying in a vacuum oven at 80°C for 60 min. In this embodiment, the ratio of the nanometer titanium dioxide to the modified solution is 10%, and the ratio of dodecyl trimethoxysilane to acetic acid and ethanol is 0.3:1.0:1.

[0048] After the polydimethylsiloxane, dodecyl trimethoxysilane, and butyl acetate and propanol are uniformly mixed in a ratio of 0.6:0.2:1.3:1, the modified nanoparticles are added to obtain an anti-pollution treatment agent, and the concentration of the modified nanoparticles is 5%.

[0049] The papermaking felt body or a layer of the papermaking felt body is immersed in the anti-pollution treatment agent, and a two-dip-two-nip process is adopted. High-temperature reaction is performed by using hot air, the reaction temperature is 80°C, and finally, plasma treatment is performed, the treatment time is 6 min, the treatment power is 1000W, and the treatment atmosphere is oxygen to obtain a hydrophilic-hydrophobic multifunctional and durable anti-pollution papermaking felt. Please refer to Figure 10 , Figure 10 The surface electron microscope graph of another embodiment of the papermaking felt. As can be seen from Figure 10 , the surface of the papermaking felt is relatively rough, and it is shown that the surface of the papermaking felt can be modified by using titanium dioxide as the nanometer oxide. Please refer to Figure 11 , Figure 11 The contact angle graph of another embodiment of the papermaking felt and the papermaking felt body. In this embodiment, Figure 11 A is the contact angle graph of the papermaking felt body, Figure 11 B is the contact angle graph of another embodiment of the papermaking felt. In this embodiment, titanium dioxide is used as the nanometer oxide in the preparation process of the papermaking felt. By comparing Figure 11 A and Figure 11B, it can be known that the contact angle of the papermaking felt is smaller than the contact angle of the papermaking felt body, that is, the contact angle of the papermaking felt obtained after modification is smaller, which can indicate that the papermaking felt prepared by the embodiment has better hydrophobic property and drainage property.

[0050] In other embodiments, nano-aluminum oxide can also be selected as the nano-oxide, and dodecyl trimethoxysilane can be selected as the coupling agent. The nano-aluminum oxide is ultrasonically dispersed in anhydrous ethanol, the ultrasonic time is 20 min, the temperature is 45°C, then a proper amount of dodecyl trimethoxysilane and acetic acid are added and ultrasonically treated for 5 min, after being uniformly mixed, the mixture is stirred at room temperature for 6 h to obtain a modified solution, the modified solution is centrifuged for 5 min to obtain a precipitate, and the precipitate is dried in a vacuum oven at 60°C for 100 min to obtain modified nano-particles. The ratio of the nano-aluminum oxide to the modified solution is 30%, and the ratio of the dodecyl trimethoxysilane to the acetic acid and ethanol is 0.4:1.1:1.

[0051] The polydimethylsiloxane, dodecyl trimethoxysilane, butyl acetate and propanol are uniformly mixed in a ratio of 0.3:0.1:1.0:1, and the modified nano-particles are added to obtain an anti-fouling treatment agent, with a concentration of 6%.

[0052] The papermaking felt body or a certain layer of the papermaking felt body is immersed in the anti-fouling treatment agent, a two-dip-two-nip process is adopted, a high-temperature reaction is performed by hot air, the reaction temperature is 80°C, and finally a plasma machine is used for treatment, the treatment time is 5 min, the treatment power is 1000W, and the treatment atmosphere is oxygen, to obtain a hydrophilic-hydrophobic multifunctional and durable anti-fouling papermaking felt.

[0053] It can be understood that the specific embodiments of the present application are not limited to the above-mentioned methods, and each embodiment within the numerical range provided in the present application is within the protection scope of the present application.

[0054] Further, the present application also provides a papermaking felt prepared by any of the above-mentioned papermaking felt preparation methods.

[0055] If the technical solutions of the present application involve personal information, the product applying the technical solutions of the present application has been explicitly informed of the personal information processing rules before processing the personal information, and has obtained the personal independent consent. If the technical solutions of the present application involve sensitive personal information, the product applying the technical solutions of the present application has obtained the personal independent consent before processing the sensitive personal information, and at the same time meets the requirement of "explicit consent". For example, at the personal information collection device such as camera, a clear and prominent mark is set to inform that it has entered the personal information collection range and will collect personal information. If the individual voluntarily enters the collection range, it is considered to agree to collect personal information. Or, on the device for processing personal information, the personal information processing rules are informed by using obvious marks / information, and the personal authorization is obtained by means of pop-up information or asking the individual to upload his / her personal information. The personal information processing rules can include personal information processor, personal information processing purpose, processing method and personal information type, etc.

[0056] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method of making a papermaking felt, characterized by, Comprising A papermaking felt body and an anti-fouling treatment agent are provided; The papermaking felt body is immersed in the anti-fouling treatment agent, and after reaction at 80-180℃ by using a padding process, the papermaking felt is obtained by plasma treatment, wherein the plasma treatment time is 3-15 min, the treatment power is 300-1500 W, and the treatment atmosphere is oxygen; The anti-fouling treatment agent is prepared from polydimethylsiloxane, a coupling agent, butyl acetate, propanol, and modified nanoparticles, the coupling agent is one or a mixture of two of a methoxysilane coupling agent and an ethoxysilane coupling agent of a long-chain alkane, the chain length of the long-chain alkane is 6-15, the mass ratio of the polydimethylsiloxane, the coupling agent, the butyl acetate, and the propanol is (0.1-0.8):(0.1-0.3):(1:1.4):1, the modified nanoparticles are obtained by modifying nano-oxides, and the step of modifying the nano-oxides comprises: The nano-oxides are dispersed in an alcohol solvent to obtain a dispersion solution; The coupling agent and an acidic solution are added to the dispersion solution, mixed uniformly, and stirred and reacted at room temperature to obtain a modified solution; The modified solution is sequentially subjected to centrifugation and drying treatment to obtain the modified nanoparticles.

2. The method of claim 1, wherein, The nano-oxides are dispersed in an alcohol solvent, comprising: The nano-oxides are ultrasonically dispersed in anhydrous ethanol, the ultrasonic time is 15-30 min, and the ultrasonic temperature is 35-55℃; And / or, the coupling agent and an acidic solution are added to the dispersion solution, mixed uniformly, comprising: After the coupling agent and the acidic solution are added to the dispersion solution, ultrasonic treatment is performed for 5-10 min.

3. The method of claim 1, wherein, The acidic solution comprises one or more of formic acid and acetic acid; And / or, the stirring time is 2-6 h; And / or, the centrifugation time is 5-15 min; And / or, the drying temperature is 60-80℃.

4. The method of claim 1, wherein, The nano-oxides comprise at least one of nano-alumina, nano-titanium oxide, nano-zinc oxide, and nano-silicon oxide.

5. A papermaking felt, characterized by, The papermaking felt is obtained by the method of any one of claims 1-4.

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