Water-repellent acid-proof modified filtering non-woven fabric and preparation method thereof
By adding modified carbon fibers and polydimethylsiloxane to nonwoven fabrics to form a hydrophobic silica layer, the problem of poor acid resistance of nonwoven fabrics in acidic environments is solved, and efficient filtration and structural stability of nonwoven fabrics in acidic environments are achieved.
Patent Information
- Application Number
- CN202511106275.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2025-11-07
AI Technical Summary
Existing nonwoven filter fabrics have poor acid resistance in acidic environments, which leads to the decomposition of fiber molecular chains, reduced filtration accuracy, and the need for frequent replacement of filter media.
Polypropylene is used as the main material, with the addition of modified carbon fiber and polydimethylsiloxane. A silica gel layer is formed on the surface of the carbon fiber by hydrolysis of tetraethyl orthosilicate, and then combined with glycerol distearate to form a hydrophobic silica layer, which improves acid resistance. At the same time, antioxidants and antistatic agents improve the antioxidant and antistatic properties of the nonwoven fabric.
Modified filter nonwoven fabrics maintain good hydrophobic properties and structural strength in acidic environments, extending their service life and avoiding frequent replacements.
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of non-woven fabric preparation, in particular to a water-repellent and acid-resistant modified filtering non-woven fabric and a preparation method thereof. BACKGROUND
[0002] Non-woven fabric is generally called non-woven cloth, which is a sheet-shaped fiber web or a fluff pad made of oriented or randomly arranged fibers through friction, adhesion, bonding or a combination of these methods. Due to its loose porous structure, non-woven fabric can effectively remove solid and soft particles, so it is widely used in liquid filtration or air purification fields.
[0003] However, the existing filtering non-woven fabric has poor acid resistance. In the filtration of acidic liquid or gas, the acid liquid can wet the filtering non-woven fabric, causing the decomposition of the molecular chain of the non-woven fabric, the expansion of the gap between the non-woven fabric fibers, and the reduction of the filtration precision, so the filtering non-woven fabric needs to be frequently replaced. SUMMARY
[0004] In order to solve the above problems, the present application provides a water-repellent and acid-resistant modified filtering non-woven fabric and a preparation method thereof.
[0005] The technical scheme of the present application is as follows: a water-repellent and acid-resistant modified filtering non-woven fabric, by weight fraction, comprising the following components: polypropylene particles 70-80 parts, modified carbon fibers 10-15 parts, antioxidants 3-5 parts, antistatic agents 1-3 parts, and polydimethylsiloxane 4-8 parts.
[0006] Note: The above modified filtering non-woven fabric uses polypropylene as the main material, and by adding modified carbon fibers, the non-woven fabric has good hydrophobicity and good acid resistance, avoiding the oxidation of carbon fibers in the acidic environment for a long time, and the compatibility of the modified carbon fibers and polypropylene is good to ensure the strength of the non-woven fabric.
[0007] Further, the preparation method of the modified carbon fibers comprises the following steps:
[0008] 1) carbon fibers are immersed in concentrated nitric acid with a mass concentration of 60-65% for 2-3 hours to obtain oxidized carbon fibers; wherein the mass ratio of carbon fibers to concentrated nitric acid is 1:4-5;
[0009] 2) tetraethyl orthosilicate is added to an ethanol solution and stirred for 10-20 min to obtain a mixed solution, and then the pH value of the mixed solution is adjusted to 3-5 using dilute hydrochloric acid with a mass concentration of 5-10%; wherein the mass ratio of tetraethyl orthosilicate to ethanol solution is 1:4-6;
[0010] 3) adding carbon fiber into the mixed solution after adjusting pH value to obtain a precursor solution, then heating the precursor solution under stirring, adding glycerol distearate into the precursor solution until the temperature of the precursor solution rises to 50-60℃, stopping heating until the temperature of the precursor solution drops by 8-12℃, then adding glycerol distearate into the precursor solution again, then keeping warm for 1-2h, and filtering to obtain intermediate fibers; wherein the mass ratio of carbon fiber to mixed solution is 1:5-6;
[0011] 4) subjecting the intermediate fibers to hydrothermal reaction at 120-150℃ for 2-4h, then filtering and drying to obtain modified carbon fibers.
[0012] Description: the above method forms a silica gel layer on the surface of carbon fiber through hydrolysis of tetraethyl orthosilicate, glycerol distearate can be combined with the silica gel layer, and a hydrophobic silica layer is formed on the carbon fiber under the action of hydrothermal reaction, thereby ensuring the hydrophobic property of the carbon fiber and improving the acid resistance of the carbon fiber.
[0013] Further, the mass concentration of the ethanol solution is 60-80%.
[0014] Description: the above concentration of the ethanol solution can ensure the hydrolysis rate of tetraethyl orthosilicate, so that the surface of the carbon fiber is fully loaded with a silica gel layer.
[0015] Further, the single addition amount of glycerol distearate accounts for 2-4% of the mass of the mixed solution.
[0016] Description: limiting the addition amount of glycerol distearate can ensure that tetraethyl orthosilicate is fully combined with the silica gel layer during hydrolysis.
[0017] Further, the antioxidant is antioxidant 1010 or antioxidant 1035.
[0018] Description: the above antioxidant can improve the antioxidant property of the non-woven fabric, avoid yellowing of the non-woven fabric during use, and improve the service life of the non-woven fabric.
[0019] Further, the antistatic agent is polyether ester amide or dodecyl dimethyl amine lactone.
[0020] Description: the above antistatic agent can reduce the surface resistance of the fiber and inhibit static accumulation.
[0021] On the other hand, the application also provides a preparation method of a water-repellent acid-proof modified filtering non-woven fabric, comprising the following steps:
[0022] 1) according to the weight parts, polypropylene particles and polydimethylsiloxane are added into a mixer, mixed at 30-50℃ for 5-10min, then modified carbon fiber is added into the mixer, heated to 60-70℃, and mixed for 10-20min to obtain a mixture;
[0023] 2) the mixture, antioxidant and antistatic agent are added into a screw extruder, melt-extruded at 270-290℃, then filtered through a filter to remove impurities to obtain a melt;
[0024] 3) the melt is sent into a melt-blowing die after metering, extruded through a spinneret, and blown by a high-pressure hot gas stream to obtain fiber filaments, which are cooled, solidified and deposited on a receiving device to form a web, and then wound to obtain a modified filtration non-woven fabric.
[0025] Description: the above preparation method first mixes polypropylene particles and polydimethylsiloxane to improve the compatibility of polypropylene particles and the surface of modified carbon fiber, so as to avoid the agglomeration of carbon fiber in the non-woven fabric, resulting in defects in the structure of the non-woven fabric, and ensure the structural strength of the modified filtration non-woven fabric.
[0026] Further, the temperature of the high-pressure hot gas stream is 260-280℃, and the pressure is 0.15-0.25Mpa.
[0027] Description: limiting the parameters of the high-pressure hot gas stream can ensure the diameter and strength of the fiber filaments, and avoid the breakage of the fiber filaments.
[0028] The beneficial effects of the present application are:
[0029] (1) The modified filtration non-woven fabric of the present application uses polypropylene as the main material, and by adding modified carbon fiber, the non-woven fabric has good hydrophobicity and good acid resistance, avoiding the oxidation of carbon fiber in the acidic environment for a long time, and the compatibility of the modified carbon fiber and polypropylene is good, which can ensure the strength of the non-woven fabric.
[0030] (2) The present application forms a silica gel layer on the surface of the carbon fiber through the hydrolysis of tetraethyl orthosilicate, and glycerol monostearate can be combined with the silica gel layer, and under the action of hydrothermal reaction, a hydrophobic silica layer is formed on the carbon fiber, which ensures the hydrophobicity of the carbon fiber and improves the acid resistance of the carbon fiber.
[0031] (3) The preparation method of the present application first mixes polypropylene particles and polydimethylsiloxane to improve the compatibility of polypropylene particles and the surface of modified carbon fiber, so as to avoid the agglomeration of carbon fiber in the non-woven fabric, resulting in defects in the structure of the non-woven fabric, and ensure the structural strength of the modified filtration non-woven fabric. DETAILED DESCRIPTION
[0032] In order to further illustrate the manner of carrying out the application and the effects achieved, the technical solutions of the application will be clearly and completely described below in conjunction with experiments.
[0033] Embodiment 1: a water-repellent acid-proof modified filtering non-woven fabric, characterized in that the following components are included by weight fraction: 75 parts of polypropylene particles, 12 parts of modified carbon fiber, 4 parts of antioxidant, 2 parts of antistatic agent, and 6 parts of polydimethylsiloxane; wherein the antioxidant is antioxidant 1010, the antistatic agent is polyether ester amide, and the polypropylene particles are random copolymer polypropylene particles;
[0034] The preparation method of the modified carbon fiber includes the following steps:
[0035] 1) carbon fiber is immersed in concentrated nitric acid with a mass concentration of 62% for 2.5 hours to obtain oxidized carbon fiber; wherein the mass ratio of carbon fiber to concentrated nitric acid is 1:4.5, and the length of carbon fiber is 1-3 mm;
[0036] 2) tetraethyl orthosilicate is added into an ethanol solution with a mass concentration of 70% and stirred for 15 min to obtain a mixed solution, and then dilute hydrochloric acid with a mass concentration of 8% is used to adjust the pH value of the mixed solution to 4; wherein the mass ratio of tetraethyl orthosilicate to the ethanol solution is 1:5;
[0037] 3) carbon fiber is added into the mixed solution after adjusting the pH value to obtain a precursor solution, and then the precursor solution is heated under stirring, when the temperature of the precursor solution rises to 32℃, glycerol bis-stearate is added into the precursor solution once, until the temperature of the precursor solution rises to 55℃, heating is stopped, and then glycerol bis-stearate is added into the precursor solution again after the temperature of the precursor solution drops by 10℃, and then the intermediate fiber is obtained after 1.5 h of heat preservation and filtration; wherein the mass ratio of carbon fiber to the mixed solution is 1:5.5, and the single addition amount of glycerol bis-stearate accounts for 3% of the mass of the mixed solution;
[0038] 4) the intermediate fiber is subjected to hydrothermal reaction at 135℃ for 3 h, and then filtered and dried to obtain the modified carbon fiber;
[0039] The preparation method of the above-mentioned water-repellent acid-proof modified filtering non-woven fabric includes the following steps:
[0040] 1) the polypropylene particles and the polydimethylsiloxane are added into a mixer by the weight fraction, mixed at 40℃ for 8 min, and then the modified carbon fiber is added into the mixer, heated to 65℃, and continuously mixed for 15 min to obtain a mixture;
[0041] 2) the mixture, the antioxidant, and the antistatic agent are added into a screw extruder, melt-extruded at 280℃, and then filtered through a filter to remove impurities to obtain a melt.
[0042] 3) The melt is sent to the melt-blowing die after metering, extruded through the spinneret holes, and blown by a high-pressure hot gas flow to obtain fiber filaments, which are cooled and solidified to deposit on a receiving device and wound into a web to obtain the modified filtering non-woven fabric; wherein the temperature of the high-pressure hot gas flow is 270°C, and the pressure is 0.2 MPa.
[0043] Example 2: This example is basically the same as Example 1, except that a water-repellent acid-proof modified filtering non-woven fabric includes the following components by weight fraction: polypropylene particles 70 parts, modified carbon fibers 10 parts, antioxidant 3 parts, antistatic agent 1 part, and polydimethylsiloxane 4 parts.
[0044] Example 3: This example is basically the same as Example 1, except that a water-repellent acid-proof modified filtering non-woven fabric includes the following components by weight fraction: polypropylene particles 80 parts, modified carbon fibers 15 parts, antioxidant 5 parts, antistatic agent 3 parts, and polydimethylsiloxane 8 parts.
[0045] Example 4: This example is basically the same as Example 1, except that the mass ratio of tetraethyl orthosilicate to ethanol solution is 1:4.
[0046] Example 5: This example is basically the same as Example 1, except that the mass ratio of tetraethyl orthosilicate to ethanol solution is 1:6.
[0047] Example 6: This example is basically the same as Example 1, except that the pH value of the mixed solution is adjusted to 3 using dilute hydrochloric acid.
[0048] Example 7: This example is basically the same as Example 1, except that the pH value of the mixed solution is adjusted to 5 using dilute hydrochloric acid.
[0049] Example 8: This example is basically the same as Example 1, except that glycerol bis-stearate is added to the precursor solution once when the temperature of the precursor solution is raised to 30°C.
[0050] Example 9: This example is basically the same as Example 1, except that glycerol bis-stearate is added to the precursor solution once when the temperature of the precursor solution is raised to 35°C.
[0051] Example 10: This example is basically the same as Example 1, except that glycerol bis-stearate is added to the precursor solution once again after the precursor solution is lowered by 8°C.
[0052] Example 11: This example is essentially the same as Example 1 except that the glycerol bis-stearate is added to the precursor solution a second time after the precursor solution has been lowered 12°C.
[0053] Example 12: This example is essentially the same as Example 1 except that the glycerol bis-stearate is added in a single addition in an amount of 2% by weight of the mixture.
[0054] Example 13: This example is essentially the same as Example 1 except that the glycerol bis-stearate is added in a single addition in an amount of 4% by weight of the mixture.
[0055] Example 14: This example is essentially the same as Example 1 except that the intermediate fibers are subjected to a hydrothermal reaction at 120°C for 2h.
[0056] Example 15: This example is essentially the same as Example 1 except that the intermediate fibers are subjected to a hydrothermal reaction at 150°C for 4h.
[0057] Example 16: This example is essentially the same as Example 1 except that the polypropylene pellets and polydimethylsiloxane are added to the mixer and mixed at 30°C for 8 min, and then the modified carbon fibers are added to the mixer and the temperature is increased to 60°C and mixed for an additional 15 min.
[0058] Example 17: This example is essentially the same as Example 1 except that the polypropylene pellets and polydimethylsiloxane are added to the mixer and mixed at 50°C for 8 min, and then the modified carbon fibers are added to the mixer and the temperature is increased to 70°C and mixed for an additional 15 min.
[0059] Example 18: This example is essentially the same as Example 1 except that the high pressure hot gas stream temperature is 260°C.
[0060] Example 19: This example is essentially the same as Example 1 except that the high pressure hot gas stream temperature is 280°C.
[0061] Example 20: This example is essentially the same as Example 1 except that the high pressure hot gas stream pressure is 0.15 Mpa.
[0062] Example 21: This example is essentially the same as Example 1 except that the high pressure hot gas stream pressure is 0.25 Mpa.
[0063] Comparative Example 1: This example is essentially the same as Example 1 except that the modified carbon fibers are replaced with unmodified carbon fibers.
[0064] Comparative Example 2: This example is essentially the same as Example 1 except that the temperature of the precursor solution is maintained at 32°C throughout.
[0065] Comparative Example 3: Referring to Example 1, glycerol distearate was added all at once into the precursor solution.
[0066] Experimental Example: In order to explore the influence of the parameters of each example on the performance of the modified filter non-woven fabric, the static contact angle of the modified filter non-woven fabric prepared in each example was tested, and the tensile strength of each modified filter non-woven fabric was tested, then each modified filter non-woven fabric was soaked in 10% hydrochloric acid for 42 hours, and then the tensile strength of the soaked modified filter non-woven fabric was tested, and the tensile strength retention rate before and after soaking was calculated, and the specific exploration is as follows
[0067] 1. Explore the influence of ingredients on the performance of the modified filter non-woven fabric
[0068] Examples 1-3 and Comparative Example 1 were used as experimental comparisons, and the performance of the modified filter non-woven fabric under different ingredients is shown in Table 1 as follows:
[0069] Table 1 Performance of modified filter non-woven fabric under different ingredients
[0070] Group Contact angle Tensile strength / MPa Tensile strength retention rate Example 1 146° 35.3 92.5％ Example 2 143° 34.8 90.3％ Example 3 142° 34.6 90.6％ Comparative Example 1 131° 29.7 83.8％
[0071] From the data in Table 1, it can be seen that Examples 1, 2 and 3: the modified filter non-woven fabric of Example 1 has the largest contact angle and the highest tensile strength retention rate, so the modified filter non-woven fabric selected in Example 1 has the best hydrophobic and acid-resistant properties, and therefore the modified filter non-woven fabric selected in Example 1 has the best composition.
[0072] Example 1 compared with Comparative Example 1: after replacing the modified carbon fiber with unmodified carbon fiber, the hydrophobic and acid-resistant properties of the modified filter non-woven fabric are both decreased, which may be because the unmodified carbon fiber cannot be effectively combined with polypropylene, so the modified filter non-woven fabric selected in Example 1 has the best composition.
[0073] 2. Explore the influence of the preparation parameters of the mixed solution on the performance of the modified filter non-woven fabric
[0074] Examples 1, 4-7 were used as experimental comparisons, and the performance of the modified filter non-woven fabric under different preparation parameters of the mixed solution is shown in Table 2 as follows:
[0075] Table 2 Performance of modified filter non-woven fabric under different preparation parameters of mixed solution
[0076] Group Contact angle Tensile strength / MPa Tensile strength retention rate Example 1 146° 35.3 92.5％ Example 4 143° 37.8 90.6％ Example 5 144° 34.1 91.2％ Example 6 140° 33.7 90.9％ Example 7 141° 33.6 90.4％
[0077] From the data in Table 2, compared with Examples 1, 4, 5, 6, 7: the contact angle of the modified filter non-woven fabric of Example 1 is the largest, and the tensile strength retention rate is the highest, so the hydrophobic performance and acid resistance of the modified filter non-woven fabric selected by Example 1 are the best, which may be because the composition and pH value of the mixed solution of Example 1 are the most suitable for the hydrolysis rate of tetraethyl orthosilicate, and the silicon dioxide layer loaded on the surface of the modified carbon fiber is the most uniform, so the composition and pH value of the mixed solution selected by Example 1 are the best.
[0078] 3. Explore the influence of intermediate fiber preparation parameters on the performance of modified filter non-woven fabric
[0079] With Examples 1, 8-15 and Comparative Examples 2 and 3 as experimental comparisons, the performance of the modified filter non-woven fabric under different preparation parameters of the intermediate fiber is shown in Table 3 as follows:
[0080] Table 3 Performance of modified filter non-woven fabric under different preparation parameters of intermediate fiber
[0081] Group Contact angle Tensile strength / MPa Tensile strength retention rate Example 1 146° 35.3 92.5％ Example 8 142° 33.5 90.5％ Example 9 141° 33.2 90.6％ Example 10 144° 34.6 91.3％ Example 11 142° 34.0 91.0％ Example 12 140° 34.2 90.8％ Example 13 141° 33.7 91.3％ Example 14 139° 33.2 90.6％ Example 15 142° 34.5 91.2％ Comparative Example 2 134° 32.2 86.3％ Comparative Example 3 132° 32.3 85.9％
[0082] From the data in Table 3, compared with Examples 1, 8, 9, 10, 11: the contact angle of the modified filter non-woven fabric of Example 1 is the largest, and the tensile strength retention rate is the highest, so the hydrophobic performance and acid resistance of the modified filter non-woven fabric selected by Example 1 are the best, which may be because the glycerol distearate of Example 1 is added at a temperature that allows the glycerol distearate to fully mix into the silicon dioxide layer on the modified carbon fiber, so the glycerol distearate addition temperature selected by Example 1 is the best;
[0083] Compared with Examples 1, 12 and 13: the contact angle of the modified filter non-woven fabric of Example 1 is the largest, and the tensile strength retention rate is the highest, so the hydrophobic performance and acid resistance of the modified filter non-woven fabric selected by Example 1 are the best, which may be because the composition of the silicon dioxide layer on the modified carbon fiber is the most uniform at the glycerol distearate addition amount of Example 1, so the glycerol distearate addition amount selected by Example 1 is the best;
[0084] Compared with Examples 1, 14 and 15: the contact angle of the modified filter non-woven fabric of Example 1 is the largest, and the tensile strength retention rate is the highest, so the hydrophobic performance and acid resistance of the modified filter non-woven fabric selected by Example 1 are the best, which may be because the silicon dioxide layer on the modified carbon fiber is the most dense at the hydrothermal reaction parameters of Example 1, so the hydrothermal reaction parameters selected by Example 1 are the best;
[0085] Compared with Comparative Examples 2 and 3, the hydrophobicity and acid resistance of the modified filter non-woven fabric of Example 1 are both reduced, which may be because the silica layer on the modified carbon fiber is not effectively combined with glycerol bis-stearate. Therefore, the glycerol bis-stearate addition method of Example 1 is the best.
[0086] 4. Effect of preparation parameters on the performance of the modified filter non-woven fabric
[0087] The performance of the modified filter non-woven fabric under different preparation parameters is shown in Table 4, with Examples 1, 16-21 as experimental comparisons.
[0088] Table 4 Performance of the modified filter non-woven fabric under different preparation parameters
[0089] Group Contact angle Tensile strength / MPa Tensile strength retention rate Example 1 146° 35.3 92.5％ Example 16 143° 34.6 91.2％ Example 17 145° 34.8 90.8％ Example 18 145° 33.2 91.1％ Example 19 142° 33.7 91.3％ Example 20 143° 32.6 90.4％ Example 21 144° 33.1 90.6％
[0090] From the data in Table 4, it can be seen that compared with Examples 16 and 17, the modified filter non-woven fabric of Example 1 has the largest contact angle and the highest tensile strength retention rate. Therefore, the hydrophobicity and acid resistance of the modified filter non-woven fabric of Example 1 are both the best, which may be because the melt components are most uniform at the mixing temperature of Example 1. Therefore, the mixing temperature of Example 1 is the best.
[0091] Compared with Examples 18, 19, 20 and 21, the modified filter non-woven fabric of Example 1 has the largest contact angle and the highest tensile strength retention rate. Therefore, the hydrophobicity and acid resistance of the modified filter non-woven fabric of Example 1 are both the best, which may be because the fiber defects are the least and the structural strength is the highest at the high-pressure hot air flow parameters of Example 1. Therefore, the high-pressure hot air flow parameters of Example 1 are the best.
Claims
1. A water-repellent and acid-proof modified filter nonwoven fabric, characterized by comprising a water-repellent and acid-proof modified fiber. By weight parts, including the following ingredients: polypropylene particles 70-80 parts, modified carbon fiber 10-15 parts, antioxidant 3-5 parts, antistatic agent 1-3 parts, polydimethylsiloxane 4-8 parts.
2. The water repellent and acid resistant modified filter nonwoven fabric according to claim 1, characterized by, The preparation method of the modified carbon fiber comprises the following steps: 1) carbon fiber is immersed in concentrated nitric acid with a mass concentration of 60-65% for 2-3 hours to obtain oxidized carbon fiber; wherein the mass ratio of carbon fiber to concentrated nitric acid is 1:4-5; 2) tetraethyl orthosilicate is added to an ethanol solution, stirred for 10-20 min to obtain a mixed solution, and then the pH value of the mixed solution is adjusted to 3-5 using dilute hydrochloric acid with a mass concentration of 5-10%; wherein the mass ratio of tetraethyl orthosilicate to ethanol solution is 1:4-6; 3) carbon fiber is added to the mixed solution after adjusting the pH value to obtain a precursor solution, and then the precursor solution is heated under stirring; when the temperature of the precursor solution rises to 30-35℃, glycerol monostearate is added to the precursor solution once; when the temperature of the precursor solution rises to 50-60℃, heating is stopped; after the temperature of the precursor solution drops by 8-12℃, glycerol monostearate is added to the precursor solution again; then after heat preservation for 1-2h, the intermediate fiber is obtained by filtration; wherein the mass ratio of carbon fiber to mixed solution is 1:5-6; 4) the intermediate fiber is subjected to hydrothermal reaction at 120-150℃ for 2-4h, and then filtered and dried to obtain the modified carbon fiber.
3. The water repellent and acid resistant modified filter nonwoven fabric according to claim 2, characterized by, The mass concentration of the ethanol solution is 60-80%.
4. The water repellent and acid resistant modified filter nonwoven fabric according to claim 2, characterized by, The single addition amount of glycerol monostearate accounts for 2-4% of the mass of the mixed solution.
5. The water repellent and acid resistant modified filter nonwoven fabric according to claim 1, wherein The antioxidant is antioxidant 1010 or antioxidant 1035.
6. The water repellent and acid resistant modified filter nonwoven fabric according to claim 1, wherein The antistatic agent is polyether ester amide or dodecyl dimethyl amine lactone.
7. The method for preparing a water-repellent and acid-proof modified filter nonwoven fabric according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: 1) according to the weight parts, polypropylene particles and polydimethylsiloxane are added to a mixer, mixed at 30-50℃ for 5-10min, and then modified carbon fiber is added to the mixer, heated to 60-70℃, and mixed for another 10-20min to obtain a mixture; 2) the mixture, antioxidant and antistatic agent are added to a screw extruder, melt extruded at 270-290℃, and then filtered through a filter to remove impurities to obtain a melt; 3) the melt is sent to a melt-blowing die after metering, extruded through a spinneret hole, and blown by a high-pressure hot gas stream to obtain fiber filaments, which are cooled and solidified to deposit on a receiving device, wound into a web, and obtained as a modified filter non-woven fabric.
8. The method for preparing a water-repellent and acid-resistant modified filter nonwoven fabric according to claim 7, characterized in that, The temperature of the high-pressure hot gas stream is 260-280℃, and the pressure is 0.15-0.25Mpa.