A method for preparing corrosion-resistant filter cloth

Abstract

The present application relates to the field of filter cloth, and specifically discloses a method for preparing corrosion-resistant filter cloth. The method for preparing corrosion-resistant filter cloth comprises the following steps: S1. preparing conductive titanium dioxide-tetrapodal zinc oxide whiskers; S2. preparing fiber A; S3. preparing filter cloth. Since the present application adopts conductive titanium dioxide-tetrapodal zinc oxide whiskers, the conductive titanium dioxide-tetrapodal zinc oxide whiskers overlap each other inside the fiber A to form a three-dimensional conductive network, which has an electrical shielding effect on the conductive ions in the chemical reagents, and produces a physical shielding effect inside the fiber A, inhibiting the diffusion of corrosive ions into the filter cloth, and comprehensively improving the corrosion resistance of the filter cloth. At the same time, the use of fiber B and fiber A blended can reduce the situation in which solid objects scratch the filter cloth during the filtration process, causing the conductive titanium dioxide-tetrapodal zinc oxide whiskers to peel off from the fiber A, thereby improving the overall stability of the three-dimensional conductive network, thereby indirectly improving the corrosion resistance of the filter cloth.

Description

Technical Field

[0001] The present invention relates to the field of filter cloth, and more particularly, to a method for preparing corrosion-resistant filter cloth. Background Art

[0002] Filter cloth is a filter medium woven from natural or synthetic fibers. It is mainly used for air filtration, dust removal and liquid-solid separation to purify the air, protect the environment and production manufacturing. It is widely used in smelting, chemical industry, sugar making, dyeing, medicine, food and other fields. When used in the above fields, the filter cloth needs to be in contact with various chemical reagents for a long time, which requires the filter cloth to have good corrosion resistance. Otherwise, the filter cloth will be damaged frequently, which increases the cost of use. Summary of the Invention

[0003] In order to improve the corrosion resistance of filter cloth, the present application provides a method for preparing corrosion-resistant filter cloth.

[0004] The present application provides a method for preparing a corrosion-resistant filter cloth using the following technical solution:

[0005] A method for preparing a corrosion-resistant filter cloth comprises the following steps:

[0006] S1. 10-15 parts by weight of tetrapod-shaped zinc oxide whiskers and 5-15 parts of conductive titanium dioxide powder are added to 50-70 parts of deionized water, 5-8 parts of tin methanesulfonate are added under stirring, followed by 0.2-0.5 parts of antimony chloride, and then 1-2 parts of a reducing agent are added. After the reaction for 1-3 hours, the pH is adjusted to 2-4, filtered, and the residue is washed twice with 3-5 times the volume of deionized water, dried at 150°C-180°C for 6-10 hours, and the dried product is heated from room temperature to 220°C-300°C and calcined for 3-5 hours, and pulverized to obtain conductive titanium dioxide - tetrapod-shaped zinc oxide whiskers;

[0007] S2. The conductive titanium dioxide in parts by weight - 15-25 parts of four-needle zinc oxide whiskers and 40-50 parts of polyester chips were mixed, extruded and granulated, and melt-spinning to obtain a fiber A;

[0008] S3. The polyamide particles are melt-spun to obtain fiber B, and the fibers A and B are twisted and stranded to obtain a filter cloth, wherein the diameter of the fiber B is larger than the diameter of the fiber A.

[0009] By adopting the above technical solution, four-needle zinc oxide whiskers are loaded with conductive titanium dioxide to form conductive whiskers. Since the four-needle zinc oxide whiskers have a unique three-dimensional four-needle structure, the conductive titanium dioxide-tetrapod zinc oxide whiskers overlap with each other inside the fiber A to form a three-dimensional conductive network, which has an electrical shielding effect on the conductive ions in the chemical reagents, thereby enhancing the corrosion resistance of the filter cloth. On the other hand, the above three-dimensional conductive network produces a physical shielding effect inside the fiber A, inhibiting the diffusion of corrosive ions into the interior of the filter cloth, thereby further improving the corrosion resistance of the filter cloth.

[0010] Fiber B has excellent wear resistance. After being blended with fiber A, it can come into contact with the solid matter in the chemical reagent before fiber A, thereby reducing the situation in which the solid matter scratches the filter cloth during the filtration process, causing the conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers to peel off from fiber A, thereby improving the overall stability of the three-dimensional conductive network, and indirectly improving the corrosion resistance of the filter cloth.

[0011] Preferably, in S1, the titanium dioxide conductive powder is pretreated before being added to the deionized water, and the pretreatment step is: adding 0.3-0.5 parts by weight of a silane coupling agent to 150-200 parts of 60-70°C deionized water and mixing evenly, then adding the titanium dioxide conductive powder in multiple times within 1-1.5 hours, with the time interval between two adjacent additions of the titanium dioxide conductive powder being 10-20 minutes. After the titanium dioxide conductive powder is added, the mixture is kept warm for 1-1.5 hours, filtered, and dried.

[0012] By adopting the above technical solution, a silane coupling agent is loaded on the surface of the titanium dioxide conductive powder. On the one hand, the hydroxyl groups on the surface of the titanium dioxide are reduced, the lipophilicity of the surface of the titanium dioxide conductive powder is improved, and the compatibility between the conductive titanium dioxide-tetrapodal zinc oxide whiskers and the molten polyester chips is improved, the uniform dispersion of the conductive titanium dioxide-tetrapodal zinc oxide whiskers in the fiber A is promoted, and it is helpful to build a three-dimensional conductive network. On the other hand, the surface energy of the titanium dioxide conductive powder is reduced, and the agglomeration between the conductive titanium dioxide-tetrapodal zinc oxide whiskers is inhibited, thereby comprehensively improving the dispersibility of the conductive titanium dioxide-tetrapodal zinc oxide whiskers in the fiber A from the aspects of compatibility and surface energy.

[0013] Preferably, the silane coupling agent is silane coupling agent KH-570.

[0014] By adopting the above technical solution, the silane coupling agent KH-570 can improve the bonding strength between the conductive titanium dioxide-tetrapodal zinc oxide whiskers and polyester, and inhibit the peeling of the conductive titanium dioxide-tetrapodal zinc oxide whiskers.

[0015] Preferably, in S2, 15-25 parts by weight of conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers and 40-50 parts of polyester chips are mixed evenly, and then 5-8 parts by weight of chitosan are added and mixed evenly, and fiber A is obtained by extrusion granulation and melt spinning.

[0016] By adopting the above technical solution, chitosan can form hydrogen bonds with polyester and thus bind to fiber A. The functional groups of elements such as N and O in chitosan can bind to protons and coordinate with metal ions in chemical reagents, thereby delaying the corrosion of the chemical reagents on the filter cloth and further improving the corrosion resistance of the filter cloth.

[0017] Preferably, in S2, 15-25 parts by weight of conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers, 2-3 parts by weight of zinc lanthanate, and 40-50 parts by weight of polyester chips are mixed evenly.

[0018] By adopting the above technical solution, zinc lanthanate has a good light conversion effect, can absorb ultraviolet rays and convert them into infrared light, reduce the impact of ultraviolet rays on the filter cloth, and then delay the aging of the filter cloth, which is beneficial to improving the durability of the filter cloth's anti-corrosion performance.

[0019] Preferably, in S3, pure acrylic emulsion is coated on the surface of fiber B and then dried at room temperature, and then twisted and stranded with fiber A.

[0020] By adopting the above technical solution, the pure acrylic emulsion has good waterproof properties after drying. After the pure acrylic emulsion is coated on the surface of the fiber B and dried, the waterproof property of the filter cloth can be improved. After the filter cloth is used, the residual time of the reagent on the filter cloth is shortened, thereby shortening the corrosion time of the reagent on the filter cloth, and indirectly improving the anti-corrosion effect of the filter cloth.

[0021] Preferably, the reducing agent is zinc.

[0022] In summary, this application has the following beneficial effects:

[0023] 1. Since the present application uses conductive titanium dioxide-tetrapodal zinc oxide whiskers, the conductive titanium dioxide-tetrapodal zinc oxide whiskers overlap each other inside the fiber A to form a three-dimensional conductive network, which has an electrical shielding effect on the conductive ions in the chemical reagent and produces a physical shielding effect inside the fiber A, inhibiting the diffusion of corrosive ions into the filter cloth, and comprehensively improving the corrosion resistance of the filter cloth. At the same time, the use of fiber B and fiber A blend can reduce the situation where solid objects scratch the filter cloth during the filtration process, causing the conductive titanium dioxide-tetrapodal zinc oxide whiskers to peel off from the fiber A, thereby improving the overall stability of the three-dimensional conductive network and indirectly improving the corrosion resistance of the filter cloth.

[0024] 2. In this application, a silane coupling agent is preferably used to load the surface of the titanium dioxide conductive powder to comprehensively improve the dispersibility of the conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers in the fiber A from the aspects of compatibility and surface energy.

[0025] 3. In this application, zinc lanthanate is preferably used. Zinc lanthanate has a good light conversion effect, can absorb ultraviolet rays and convert them into infrared light, delay the aging of the filter cloth, and is beneficial to improving the durability of the filter cloth's anti-corrosion performance. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the embodiments.

[0027] raw material Information Sources Titanium dioxide conductive powder Crystal form: rutile; particle size: 50-100nm Polyester chips Brand: WK-821 Polyamide particles Brand: HX2544 Pure acrylic emulsion Model: JYS154

[0028] Unless otherwise specified, the raw materials used in the following embodiments can be obtained from common commercial sources.

[0029] Example

[0030] Example 1

[0031] The present application discloses a method for preparing a corrosion-resistant filter cloth, comprising the following steps:

[0032] S1. 10 parts by weight of tetrapod-shaped zinc oxide whiskers and 5 parts of conductive titanium dioxide powder were added to 50 parts of deionized water, 5 parts of tin methanesulfonate were added under stirring, and then 0.2 parts of antimony chloride were added, and then 1 part of a reducing agent was added, wherein the reducing agent was zinc. After the reaction for 1 hour, the pH was adjusted to 2, the mixture was filtered, and the filter residue was washed twice with 3 volumes of deionized water and dried at 150°C for 10 hours. The dried product was heated from room temperature to 220°C and calcined for 5 hours. The product was crushed by a jet mill to obtain conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers.

[0033] S2. The conductive titanium dioxide in parts by weight - 15 parts of four-needle zinc oxide whiskers and 40 parts of polyester chips were mixed, extruded and granulated, and melt-spinning to obtain a fiber A;

[0034] S3. Fiber B is prepared by melt spinning polyamide particles, and fiber A and fiber B are twisted and stranded in a ratio of 1:1 to obtain a filter cloth. The diameter of fiber B is larger than that of fiber A.

[0035] Example 2

[0036] The present application discloses a method for preparing a corrosion-resistant filter cloth, comprising the following steps:

[0037] S1. 15 parts by weight of tetrapod-shaped zinc oxide whiskers and 15 parts of conductive titanium dioxide powder were added to 70 parts of deionized water, 8 parts of tin methanesulfonate were added under stirring, and then 0.5 parts of antimony chloride were added, and then 2 parts of a reducing agent, wherein zinc was used as the reducing agent. After reacting for 3 hours, the pH was adjusted to 4, filtered, and the residue was washed twice with 5 volumes of deionized water and dried at 180°C for 6 hours. The dried product was heated from room temperature to 300°C and calcined for 3 hours. The product was crushed by a jet mill to obtain conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers.

[0038] S2. The conductive titanium dioxide in parts by weight - 25 parts of four-needle zinc oxide whiskers and 50 parts of polyester chips were mixed, extruded and granulated, and melt-spinning to obtain a fiber A;

[0039] S3. Fiber B is prepared by melt spinning polyamide particles, and fiber A and fiber B are twisted and stranded in a ratio of 1:1 to obtain a filter cloth. The diameter of fiber B is larger than that of fiber A.

[0040] Example 3

[0041] The present application discloses a method for preparing a corrosion-resistant filter cloth, comprising the following steps:

[0042] S1. 13 parts by weight of tetrapod-shaped zinc oxide whiskers and 10 parts of titanium dioxide conductive powder were added to 60 parts of deionized water, 7 parts of tin methanesulfonate were added under stirring, followed by 0.3 parts of antimony chloride and 1 part of a reducing agent, wherein zinc was used as the reducing agent. After reacting for 2 hours, the pH was adjusted to 3, filtered, and the residue was washed twice with 4 times the volume of deionized water and dried at 170°C for 8 hours. The dried product was heated from room temperature to 260°C and calcined for 4 hours. The product was pulverized by a jet mill to obtain conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers.

[0043] S2. The conductive titanium dioxide in parts by weight - 20 parts of four-needle zinc oxide whiskers and 45 parts of polyester chips were mixed uniformly, and then granulated by extrusion and melt spinning to obtain a fiber A;

[0044] S3. Fiber B is prepared by melt spinning polyamide particles, and fiber A and fiber B are twisted and stranded in a ratio of 1:1 to obtain a filter cloth. The diameter of fiber B is larger than that of fiber A.

[0045] Example 4

[0046] The difference from Example 1 is that in step S1, the titanium dioxide conductive powder is pretreated before being added to deionized water. The pretreatment step is: 0.3 parts by weight of a silane coupling agent is added to 150 parts of deionized water at 60°C and mixed evenly, and then the titanium dioxide conductive powder is added in multiple times within 1 hour, with the time interval between two adjacent additions of the titanium dioxide conductive powder being 10 minutes. After the titanium dioxide conductive powder is added, the mixture is kept warm for 1 hour, filtered, and dried. The silane coupling agent used is silane coupling agent KH-570.

[0047] Example 5

[0048] The difference from Example 1 is that in step S2, 15 parts by weight of conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers and 40 parts of polyester chips are mixed evenly, and then 5 parts by weight of chitosan are added and mixed evenly, and fiber A is obtained by extrusion granulation and melt spinning.

[0049] Example 6

[0050] The difference from Example 1 is that in step S2, 15 parts by weight of conductive titanium dioxide-tetrapodal zinc oxide whiskers, 2 parts by weight of zinc lanthanate and 40 parts by weight of polyester chips are mixed uniformly, and then extruded, granulated and melt-spun to obtain fiber A.

[0051] Example 7

[0052] The difference from Example 1 is that in step S3, pure acrylic emulsion is coated on the surface of fiber B and then dried at room temperature, and then fiber A and fiber B are mixed and twisted and woven to obtain a filter cloth, and the diameter of fiber B is larger than that of fiber A.

[0053] Example 8

[0054] S1. The titanium dioxide conductive powder was pretreated, the pretreatment steps being: adding 0.3 parts by weight of a silane coupling agent to 150 parts of deionized water at 60°C and mixing uniformly, then adding the titanium dioxide conductive powder in multiple portions within 1 hour, with the interval between the additions of the titanium dioxide conductive powder being 10 minutes, and after the addition of the titanium dioxide conductive powder was completed, the mixture was kept warm for 1 hour, filtered, and dried. The silane coupling agent used was silane coupling agent KH-570;

[0055] Then, 10 parts by weight of tetrapod-shaped zinc oxide whiskers and 5 parts of pretreated titanium dioxide conductive powder are added to 50 parts of deionized water, 5 parts of tin methanesulfonate are added under stirring, and then 0.2 parts of antimony chloride is added, and then 1 part of a reducing agent is added, wherein the reducing agent is zinc. After reacting for 1 hour, the pH is adjusted to 2, the mixture is filtered, and the filter residue is washed twice with 3 times the volume of deionized water, dried at 150°C for 10 hours, and the dried product is heated from room temperature to 220°C and calcined for 5 hours, and pulverized by a jet mill to obtain conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers;

[0056] S2. After mixing 15 parts by weight of conductive titanium dioxide - tetrapod-shaped zinc oxide whiskers, 2 parts of zinc lanthanate and 40 parts of polyester chips, 5 parts by weight of chitosan were added and mixed, and then extruded and granulated, and melt-spun to obtain fiber A;

[0057] S3. Fiber B is prepared by melt spinning polyamide particles. A pure acrylic emulsion is coated on the surface of fiber B and then dried at room temperature. Fiber A and fiber B are then twisted and stranded in a 1:1 ratio to obtain a filter cloth. The diameter of fiber B is larger than that of fiber A.

[0058] Example 9

[0059] S1. The titanium dioxide conductive powder was pretreated, the pretreatment steps being: adding 0.5 parts by weight of a silane coupling agent to 200 parts of deionized water at 70°C and mixing uniformly, then adding the titanium dioxide conductive powder in multiple portions over 1.5 hours, with the interval between the additions of the titanium dioxide conductive powder being 20 minutes. After the addition of the titanium dioxide conductive powder was completed, the mixture was kept warm for 1.5 hours, filtered, and dried. The silane coupling agent used was silane coupling agent KH-570;

[0060] Then, 15 parts by weight of tetrapod-shaped zinc oxide whiskers and 15 parts of pretreated titanium dioxide conductive powder are added to 70 parts of deionized water, 8 parts of tin methanesulfonate are added under stirring, and then 0.5 parts of antimony chloride is added, and then 2 parts of a reducing agent is added, wherein the reducing agent is zinc. After reacting for 3 hours, the pH is adjusted to 4, the mixture is filtered, and the filter residue is washed twice with 5 volumes of deionized water, dried at 180° C. for 6 hours, and the dried product is heated from room temperature to 300° C. and calcined for 3 hours, and pulverized by a jet mill to obtain conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers;

[0061] S2. After mixing 25 parts by weight of conductive titanium dioxide - tetrapod-shaped zinc oxide whiskers, 3 parts of zinc lanthanate and 50 parts of polyester chips, 8 parts by weight of chitosan were added and mixed, and then extruded and granulated, and melt-spun to obtain fiber A;

[0062] S3. Fiber B is prepared by melt spinning polyamide particles. A pure acrylic emulsion is coated on the surface of fiber B and then dried at room temperature. Fiber A and fiber B are then twisted and stranded in a 1:1 ratio to obtain a filter cloth. The diameter of fiber B is larger than that of fiber A.

[0063] Example 10

[0064] S1. The titanium dioxide conductive powder was pretreated, the pretreatment steps being: adding 0.4 parts by weight of a silane coupling agent to 170 parts of deionized water at 65°C and mixing uniformly, then adding the titanium dioxide conductive powder in multiple portions within 1 hour, with the interval between the additions of the titanium dioxide conductive powder being 15 minutes. After the addition of the titanium dioxide conductive powder was completed, the mixture was kept warm for 1 hour, filtered, and dried. The silane coupling agent used was silane coupling agent KH-570;

[0065] Then, 13 parts by weight of tetrapod-shaped zinc oxide whiskers and 10 parts of pretreated titanium dioxide conductive powder are added to 60 parts of deionized water, 7 parts of tin methanesulfonate are added under stirring, and then 0.3 parts of antimony chloride is added, and then 1 part of a reducing agent is added, wherein the reducing agent is zinc. After reacting for 2 hours, the pH is adjusted to 3, the mixture is filtered, and the filter residue is washed twice with 4 times the volume of deionized water, dried at 170° C. for 8 hours, and the dried product is heated from room temperature to 260° C. and calcined for 4 hours, and pulverized by a jet mill to obtain conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers;

[0066] S2. After mixing 20 parts by weight of conductive titanium dioxide - tetrapod-shaped zinc oxide whiskers, 2 parts of zinc lanthanate and 45 parts of polyester chips, 7 parts by weight of chitosan were added and mixed, and then extruded and granulated, and melt-spun to obtain fiber A;

[0067] S3. Fiber B is prepared by melt spinning polyamide particles. A pure acrylic emulsion is coated on the surface of fiber B and then dried at room temperature. Fiber A and fiber B are then twisted and stranded in a 1:1 ratio to obtain a filter cloth. The diameter of fiber B is larger than that of fiber A.

[0068] Example 11

[0069] The difference from Example 5 is that chitosan is replaced by trehalose.

[0070] Example 12

[0071] The difference from Example 6 is that zinc lanthanate is replaced by zinc oxide.

[0072] Example 13

[0073] The difference from Example 7 is that the pure acrylic emulsion is replaced by acetic acid acrylic emulsion.

[0074] Comparative Example

[0075] Comparative Example 1

[0076] The difference from Example 1 is that the conductive titanium dioxide-tetrapodal zinc oxide whiskers in step S2 are replaced with a filter cloth made of tetrapodal zinc oxide whiskers as a blank control group.

[0077] Comparative Example 2

[0078] The difference from Example 1 is that the titanium dioxide conductive powder is replaced by silicon dioxide.

[0079] Performance testing

[0080] (1) Anti-corrosion Performance Test: Three samples of each of Examples 1-13 and Comparative Examples 1-2 were immersed in 20 wt % acetic acid solution, 20 wt % sodium carbonate solution, and 20 wt % sodium chloride solution for 15 days, respectively. The tensile strength at break was tested according to standard GB / T 7689.5-2013, and the strength loss rate was calculated according to the following formula:

[0081] Strength loss rate = [(untreated sample breaking strength - treated sample breaking strength) / untreated sample breaking strength] × 100%

[0082] The test results are shown in Tables 1-1 and 1-2 below.

[0083] (2) Anti-ultraviolet performance test: The samples of Examples 1, 6 and 12 were irradiated under ultraviolet light for 10 days, and the tensile strength at break was tested according to the standard GB / T 7689.5-2013, and the strength loss rate was calculated according to the following formula:

[0084] Strength loss rate = [(untreated sample breaking strength - treated sample breaking strength) / untreated sample breaking strength] × 100%

[0085] The test results are shown in Table 2 below.

[0086] (3) Waterproof performance test: The samples of Examples 1, 7 and 13 were immersed in water and allowed to stand for 3 minutes. The sample specifications were 100 mm × 100 mm × 2 mm. The samples were then taken out and the upper ends of the samples were clamped with binder clips so that the samples were kept hanging and the lower ends were suspended. The samples were allowed to stand at room temperature in the same ventilated environment. The time was started from the time when the samples stopped dripping, and the time when the samples were completely dry was recorded. The test results are shown in Table 3 below.

[0087] Table 1-1 Anti-corrosion performance test results

[0088]

[0089] Table 1-2 Anti-corrosion performance test results

[0090]

[0091] Table 2 Anti-ultraviolet performance test results

[0092] Example 1 Example 6 Example 12 Strength loss rate / % 2.14 1.63 1.91

[0093] Table 3 Waterproof performance test results

[0094] Example 1 Example 7 Example 13 Drying time / h 5.3 4.2 4.8

[0095] In summary, we can draw the following conclusions:

[0096] 1. In combination with Example 1 and Comparative Examples 1-2 and Tables 1-1 and 1-2, it can be seen that the addition of conductive titanium dioxide-tetrapodal zinc oxide whiskers to the filter cloth can improve the corrosion resistance of the filter cloth. The reason for this may be that the tetrapodal zinc oxide whiskers are loaded with conductive titanium dioxide to form conductive whiskers. Since the tetrapodal zinc oxide whiskers have a unique three-dimensional four-needle structure, the conductive titanium dioxide-tetrapodal zinc oxide whiskers overlap with each other inside the fiber A to form a three-dimensional conductive network, which has an electrical shielding effect on the conductive ions in the chemical reagents and enhances the corrosion resistance of the filter cloth. In addition, the above-mentioned three-dimensional conductive network produces a physical shielding effect inside the fiber A, inhibiting the diffusion of corrosive ions into the interior of the filter cloth, further improving the corrosion resistance of the filter cloth.

[0097] 2. In combination with Examples 1 and 4 and Tables 1-1 and 1-2, it can be seen that pretreatment of the conductive titanium dioxide powder helps to improve the anti-corrosion effect of the filter cloth. The reason may be that: loading the silane coupling agent on the surface of the conductive titanium dioxide powder improves the lipophilicity of the surface of the conductive titanium dioxide powder, promotes the uniform dispersion of the conductive titanium dioxide-tetrapodal zinc oxide whiskers in the fiber A, contributes to the construction of a three-dimensional conductive network, and reduces the surface energy of the conductive titanium dioxide powder. It inhibits the agglomeration of the conductive titanium dioxide-tetrapodal zinc oxide whiskers, further improves the dispersibility of the conductive titanium dioxide-tetrapodal zinc oxide whiskers in the fiber A, thereby helping to improve the anti-corrosion effect of the filter cloth.

[0098] 3. From Examples 1, 5, and 11 and Tables 1-1 and 1-2, it can be seen that adding chitosan to the filter cloth can improve the anti-corrosion effect of the filter cloth. The reason may be that chitosan can form hydrogen bonds with polyester and thus bind to fiber A. The functional groups of elements such as N and O in chitosan can bind to protons and coordinate with metal ions in chemical reagents, thereby delaying the corrosion of the filter cloth by the chemical reagents and improving the anti-corrosion performance of the filter cloth.

[0099] 4. From Examples 1, 6, and 12 and Tables 1-1, 1-2, and 2, it can be seen that the addition of zinc lanthanate to the filter cloth can improve the UV protection effect of the filter cloth. The reason for this may be that zinc lanthanate has a good light conversion effect, which can absorb ultraviolet light and convert it into infrared light, reducing the impact of ultraviolet light on the filter cloth, thereby delaying the aging of the filter cloth and improving the durability of the filter cloth's anti-corrosion performance.

[0100] 5. From Examples 1, 7, and 13 and Tables 1-1, 1-2, and 3, it can be seen that coating the surface of fiber B with pure acrylic emulsion can improve the waterproof effect of the filter cloth, thereby indirectly improving the anti-corrosion effect of the filter cloth. The reason may be that pure acrylic emulsion has good waterproof properties after drying. Coating the pure acrylic emulsion on the surface of fiber B and drying it can improve the waterproofness of the filter cloth. After the filter cloth is used, the residual time of the reagent on the filter cloth is shortened, thereby shortening the corrosion time of the reagent on the filter cloth.

[0101] 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 non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing a corrosion-resistant filter cloth, characterized in that: The following steps are involved: S1. 10-15 parts by weight of tetrapod-shaped zinc oxide whiskers and 5-15 parts of conductive titanium dioxide powder are added to 50-70 parts of deionized water, 5-8 parts of tin methanesulfonate are added under stirring, followed by 0.2-0.5 parts of antimony chloride, and then 1-2 parts of a reducing agent are added. After the reaction for 1-3 hours, the pH is adjusted to 2-4, filtered, and the residue is washed twice with 3-5 times the volume of deionized water, dried at 150°C-180°C for 6-10 hours, and the dried product is heated from room temperature to 220°C-300°C and calcined for 3-5 hours, and pulverized to obtain conductive titanium dioxide - tetrapod-shaped zinc oxide whiskers; S2. After mixing 15-25 parts by weight of conductive titanium dioxide - tetrapod-shaped zinc oxide whiskers and 40-50 parts of polyester chips, 5-8 parts by weight of chitosan were added and mixed, and the mixture was extruded and granulated, and melt-spun to obtain fiber A. The fiber A was extruded and granulated, and melt-spinning was performed; S3. The polyamide particles are melt-spun to obtain fiber B, and the fibers A and B are twisted and stranded to obtain a filter cloth, wherein the diameter of the fiber B is larger than the diameter of the fiber A.

2. The method for preparing the corrosion-resistant filter cloth according to claim 1, characterized in that: In S1, the titanium dioxide conductive powder is pretreated before being added to the deionized water. The pretreatment step is: adding 0.3-0.5 parts by weight of a silane coupling agent to 150-200 parts of 60-70°C deionized water and mixing them evenly, then adding the titanium dioxide conductive powder in multiple times within 1-1.5 hours, with the time interval between two adjacent additions of the titanium dioxide conductive powder being 10-20 minutes. After the addition of the titanium dioxide conductive powder is completed, the mixture is kept warm for 1-1.5 hours, filtered, and dried.

3. The method for preparing the corrosion-resistant filter cloth according to claim 2, characterized in that: The silane coupling agent is silane coupling agent KH-570.

4. The method for preparing the corrosion-resistant filter cloth according to claim 1, wherein: In the step S2, 15-25 parts by weight of conductive titanium dioxide-tetrapod-shaped zinc oxide whiskers, 2-3 parts by weight of zinc lanthanate, and 40-50 parts by weight of polyester chips are mixed evenly.

5. The method for preparing the corrosion-resistant filter cloth according to claim 1, wherein: In the above S3, pure acrylic emulsion is coated on the surface of fiber B and then dried at room temperature, and then twisted and stranded with fiber A.

6. The method for preparing the corrosion-resistant filter cloth according to claim 1, wherein: The reducing agent is zinc.

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