Gasification fine slag deep dewatering and drying filter cloth

Abstract

This invention discloses a filter cloth for deep dewatering and drying of gasified fine slag, belonging to the field of filter cloth processing technology. This invention addresses the technical problems of existing filter cloth materials, such as easy clogging of pores, poor filtration effect, poor high-temperature resistance and abrasion resistance, easy damage, and short service life. The filter cloth for deep dewatering and drying of gasified fine slag is obtained through the following steps: p-phenylenediamine and N-methylpyrrolidone are added to a three-necked flask and stirred until dissolved. Then, 3,3',4,4'-benzophenone tetracarboxylic dianhydride and composite silicone resin are added to the three-necked flask and stirred for 5-6 hours. Finally, triethylamine is added to the three-necked flask. This invention, by preparing composite silicone resin and polyamide into spun fibers and then surface-modifying the spun fibers, effectively improves the hydrophobicity, high-temperature resistance, abrasion resistance, and mechanical properties of the filter cloth material, thereby improving the dewatering and drying effect of gasified fine slag while extending the service life of the filter cloth material.

Description

Technical Field

[0001] This invention relates to the field of filter cloth processing technology, specifically to a filter cloth for deep dehydration and drying of gasified fine slag. Background Technology

[0002] Gasification slag, or waste residue generated during the gasification process, is a solid waste produced in processes such as shale gas and coking gas production. The solid particles in gasification slag often contain moisture and volatile components, the presence of which can affect the quality and stability of the gaseous products. Therefore, it is essential to dehydrate and dry the gasification slag to reduce the moisture and volatile components to acceptable levels.

[0003] In existing technologies, gasification slag is often dehydrated by filtration. However, traditional filter cloths have poor hydrophobicity. The gasification slag contains moisture and impurities, which easily wet the filter cloth during filtration, forming a dense layer of gasification slag that clogs the pores of the filter cloth. This results in poor dehydration and filtration efficiency. Furthermore, traditional filter cloths have poor high-temperature resistance and are prone to shrinkage and deformation in high-temperature environments, leading to material loss. During the dehydration and drying of the gasification slag, the solid particles contained in the slag rub against the filter cloth. Under strong friction, the filter cloth is easily damaged, resulting in a short lifespan.

[0004] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a filter cloth for deep dehydration and drying of gasified fine slag, which solves the technical problems of poor hydrophobicity of filter cloth materials in the prior art, easy clogging of pores on the filter cloth during filtration, resulting in poor dehydration and filtration effect of gasified fine slag, and poor high temperature resistance and abrasion resistance of traditional filter cloths, which are easily damaged and have a short service life when dehydrating and drying gasified fine slag.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A filter cloth for deep dewatering and drying of gasified fine slag is obtained by the following steps:

[0008] S1. Add p-phenylenediamine and N-methylpyrrolidone to a three-necked flask and stir until dissolved. Then add 3,3',4,4'-benzophenone tetracarboxylic dianhydride and composite silicone resin to the three-necked flask and stir for 5-6 hours. Add triethylamine to the three-necked flask and stir for 50-60 minutes. Allow the mixture to stand under vacuum to remove bubbles and obtain the spinning solution.

[0009] S2. Load the spinning solution into a syringe with an inner diameter of 0.5-0.6 mm. Extrude the spinning solution into a molding solution at a temperature of 15-20℃ at an extrusion rate of 1 mL / min. Soak for 8-10 hours and then process to obtain spun fibers.

[0010] The chemical reactions involved in the spinning and forming of fibers include:

[0011]

[0012] S3. Add the spinning fiber and the modification solution to a beaker, and ultrasonically disperse it for 20-30 minutes at room temperature. Then, while maintaining the ultrasonic dispersion, add 0.1M sodium hydroxide solution to the beaker and react for 40-60 minutes. After post-treatment, the modified fiber is obtained.

[0013] S4. Add the modified fiber to the twisting machine and twist it into strands using the S-twist method to prepare spun yarn;

[0014] S5. Use a textile machine to weave spun yarns into textile fabrics with a certain structure, width and density;

[0015] S6. Place the textile fabric in a hot rolling mill at a temperature of 250-300℃ for double-sided hot rolling for 10-15 minutes, and then cool it to room temperature to obtain the filter cloth material.

[0016] Furthermore, the preparation method of the composite silicone resin is as follows: adding hydrogen-containing silicone oil, 1-tetradecene, 3-butenyltriethoxysilane, and isopropanol into a three-necked flask and stirring, raising the temperature of the three-necked flask to 75-85°C, adding a catalyst into the three-necked flask, maintaining the temperature for 5-7 hours, adding ammonia water into the three-necked flask, maintaining the temperature for 60-90 minutes, and obtaining the composite silicone resin.

[0017] Furthermore, the ratio of the hydrogen-containing silicone oil, 1-tetradecene, 3-butenyltriethoxysilane, isopropanol, catalyst, and ammonia is 10g:5g:2g:20g:0.1g:5g. The catalyst is chloroplatinic acid. The post-treatment operation includes: after the reaction is complete, adding 0.1M hydrochloric acid to a three-necked flask to adjust the pH of the system to 7, maintaining the temperature of the three-necked flask at 85-95℃, and removing low-boiling substances by vacuum distillation to obtain the composite silicone resin.

[0018] The synthesis reaction principle of composite silicone resin is as follows:

[0019]

[0020]

[0021] Furthermore, in step S1, the ratio of p-phenylenediamine, N-methylpyrrolidone, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, composite silicone resin, and triethylamine is 1g:30g:3g:2g:2g.

[0022] Furthermore, in step S2, the molding solution is composed of acetic anhydride, triethylamine, and acetone in a ratio of 3g:2g:40g. The post-treatment operation includes: after soaking, removing it from the molding solution, washing it three times with acetone, transferring it to a drying oven at a temperature of 280-300℃, and keeping it warm for 2-3 hours to obtain spun fibers.

[0023] Furthermore, the modified liquid in step S3 is prepared by adding perfluorooctyltriethoxysilane, tetraethyl orthosilicate and anhydrous ethanol into a beaker at a ratio of 1g:2g:10g and mixing them evenly to obtain the modified liquid.

[0024] Furthermore, in step S3, the ratio of the amount of spinning fiber, the modifying solution, and the 0.1M sodium hydroxide solution is 1g:10g:2g. The post-treatment operation includes: after the reaction is completed, filtration is performed, the filter cake is washed with purified water until neutral, then washed once with anhydrous ethanol, and the filter cake is transferred to a drying oven at a temperature of 70-80℃ and dried to constant weight to obtain modified fiber.

[0025] The present invention has the following beneficial effects:

[0026] 1. The gasification fine slag deep dehydration and drying filter cloth of the present invention is prepared using hydrogen-containing silicone oil, 1-tetradecene, and 3-butenyltriethoxysilane as raw materials. Under the catalysis of a catalyst, the olefin double bond undergoes a substitution addition reaction with the hydrogen on the hydrogen-containing silicone oil to prepare a hydrogen-containing silicone oil intermediate containing siloxane bonds and a long carbon chain structure. In an ammonia water environment, the siloxane bonds on the hydrogen-containing silicone oil break and self-assemble, so that the molecular chains of the hydrogen-containing silicone oil are cross-linked with each other by siloxane bonds to prepare a composite silicone resin. In addition to the network cross-linking structure formed by siloxane bonds between the molecular chains of the composite silicone resin, the long branched carbon chains on the hydrogen-containing silicone oil can further promote the cross-linking between molecular chains, further improving the degree of cross-linking of the composite silicone resin, thereby improving the mechanical strength, high temperature resistance and wear resistance of the composite silicone resin.

[0027] 2. The gasified fine slag deep dehydration and drying filter cloth of the present invention is prepared by using p-phenylenediamine and 3,3',4,4'-benzophenone tetracarboxylic dianhydride as raw materials, dissolving them in N-methylpyrrolidone, and then mixing them with composite silicone resin and triethylamine to prepare a spinning solution. This solution is then injected and extruded into a molding solution. Simultaneously, an amidation reaction occurs in the molding solution as a sol-gel transition, resulting in a composite spun fiber composed of polyamide and composite silicone resin. The long-branched carbon chains on the composite silicone resin act like surfactants, improving the dispersion of the composite silicone resin in the solution and facilitating more uniform dispersion of silicone oil in the polyamide solution. In the liquid, it prevents the aggregation between composite silicone resin molecules, thereby improving dispersibility, enhancing the bonding between composite silicone resin and polyamide molecules, and improving the compatibility between them. This allows a stable interface to be formed between the composite silicone resin and polyamide molecules, thereby improving the overall mechanical, high-temperature resistance, and abrasion resistance properties of the spun fibers. The long-branched carbon chains of the composite silicone resin can provide a hydrophobic and porous layer, which, in combination with hydrogen-containing silicone oil, improves the hydrophobic properties of the composite silicone resin. The mixing of composite silicone resin and polyamide molecules helps to reduce the surface energy of the spun fibers, making the surface of the spun fibers more hydrophobic, preventing water penetration, and improving the hydrophobicity and durability of the filter cloth material.

[0028] 3. The gasified fine slag deep dehydration and drying filter cloth of the present invention is prepared by mixing perfluorooctyltriethoxysilane, tetraethyl orthosilicate and anhydrous ethanol to prepare a modification solution, which is then used to modify the spun fibers in an alkaline environment. A polysiloxane and perfluorooctyl modification layer is grafted onto the surface of the spun fibers. Polysiloxane and perfluorooctyl have strong hydrophobicity. Coating them onto the surface of the spun fibers makes the fiber surface more hydrophobic, and water droplets form a smaller contact angle on the surface, thus having better water resistance. The properties of perfluorooctyl cause it to form a "lotus leaf effect" structure on the surface, preventing pollutant adsorption, making the fiber surface easier to clean, reducing the adsorption and adhesion of pollutants on the fiber surface, and making the modified fibers more resistant to stains and pollutant damage. Furthermore, perfluorooctyl has excellent chemical stability, which can prevent the fibers from corroding in acidic and alkaline chemical environments, thereby improving the corrosion resistance of the filter cloth material. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] This embodiment provides a method for preparing a filter cloth for deep dehydration and drying of gasified fine slag, including the following steps:

[0032] S1. Preparation of composite silicone resin

[0033] Weigh out 50g of hydrogen-containing silicone oil, 25g of 1-tetradecene, 10g of 3-butenyltriethoxysilane, and 100g of isopropanol and add them to a three-necked flask. Stir the mixture and raise the temperature of the three-necked flask to 75°C. Add 0.5g of chloroplatinic acid to the three-necked flask and keep the mixture at this temperature for 5 hours. Add 25g of ammonia water to the three-necked flask and keep the mixture at this temperature for 60 minutes. Add 0.1M hydrochloric acid to the three-necked flask to adjust the pH of the system to 7. Keep the temperature of the three-necked flask at 85°C and remove low-boiling-point substances by vacuum distillation to obtain the composite silicone resin.

[0034] S2. Preparation of spinning solution

[0035] Weigh out 20g of p-phenylenediamine and 600g of N-methylpyrrolidone and add them to a three-necked flask. Stir until dissolved. Then add 60g of 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 40g of composite silicone resin to the three-necked flask and stir for 5 hours. Add 40g of triethylamine to the three-necked flask and stir for 50 minutes. Allow the mixture to stand under vacuum to remove bubbles and obtain the spinning solution.

[0036] S3, Preparation of spinning fibers

[0037] Acetic anhydride, triethylamine, and acetone were added to a beaker in a ratio of 3g:2g:40g and mixed thoroughly to obtain a molding solution.

[0038] The spinning solution was loaded into a syringe with a needle inner diameter of 0.5 mm. The spinning solution was extruded into a molding solution at a temperature of 15°C at an extrusion rate of 1 mL / min. After soaking for 8 hours, the solution was removed from the molding solution, washed three times with acetone, and then transferred to a drying oven at a temperature of 280°C for 2 hours to obtain spun fibers.

[0039] S4, Modified Spinning Fibers

[0040] Perfluorooctyltriethoxysilane, tetraethyl orthosilicate, and anhydrous ethanol were added to a beaker at a ratio of 1g:2g:10g and mixed thoroughly to obtain the modified solution.

[0041] Weigh 10g of spinning fiber and 100g of modification solution into a beaker. Disperse the mixture ultrasonically for 20min at room temperature. Maintain the ultrasonic dispersion state and add 20g of 0.1M sodium hydroxide solution to the beaker. React for 40min, filter, wash the filter cake with purified water until neutral, wash once with anhydrous ethanol, and transfer the filter cake to a drying oven at 70℃ to dry to constant weight to obtain modified fiber.

[0042] S5. Preparation of filter cloth material

[0043] Modified fibers are added to a twisting machine and twisted together using an S-twist method to prepare spun yarn;

[0044] Using a textile machine to weave spun yarns into textiles with a certain structure, width, and density;

[0045] The textile fabric is placed in a hot rolling mill at a temperature of 250°C for double-sided hot rolling for 10 minutes, and then cooled to room temperature to obtain filter cloth material.

[0046] Example 2

[0047] This embodiment provides a method for preparing a filter cloth for deep dehydration and drying of gasified fine slag, including the following steps:

[0048] S1. Preparation of composite silicone resin

[0049] Weigh out 50g of hydrogen-containing silicone oil, 25g of 1-tetradecene, 10g of 3-butenyltriethoxysilane, and 100g of isopropanol and add them to a three-necked flask. Stir the mixture and raise the temperature of the three-necked flask to 80℃. Add 0.5g of chloroplatinic acid to the three-necked flask and keep the mixture at this temperature for 6 hours. Add 25g of ammonia water to the three-necked flask and keep the mixture at this temperature for 75 minutes. Add 0.1M hydrochloric acid to the three-necked flask to adjust the pH of the system to 7. Keep the temperature of the three-necked flask at 90℃ and remove low-boiling-point substances by vacuum distillation to obtain the composite silicone resin.

[0050] S2. Preparation of spinning solution

[0051] Weigh out 20g of p-phenylenediamine and 600g of N-methylpyrrolidone and add them to a three-necked flask. Stir until dissolved. Then add 60g of 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 40g of composite silicone resin to the three-necked flask and stir for 5.5h. Add 40g of triethylamine to the three-necked flask and stir for 55min. Under vacuum, allow to stand to remove bubbles to obtain the spinning solution.

[0052] S3, Preparation of spinning fibers

[0053] Acetic anhydride, triethylamine, and acetone were added to a beaker in a ratio of 3g:2g:40g and mixed thoroughly to obtain a molding solution.

[0054] The spinning solution was loaded into a syringe with a needle inner diameter of 0.5 mm. The spinning solution was extruded into a molding solution at a temperature of 17°C at an extrusion rate of 1 mL / min. After soaking for 9 hours, the solution was removed from the molding solution, washed three times with acetone, and then transferred to a drying oven at a temperature of 290°C for 2.5 hours to obtain spun fibers.

[0055] S4, Modified Spinning Fibers

[0056] Perfluorooctyltriethoxysilane, tetraethyl orthosilicate, and anhydrous ethanol were added to a beaker at a ratio of 1g:2g:10g and mixed thoroughly to obtain the modified solution.

[0057] Weigh 10g of spinning fiber and 100g of modification solution into a beaker. Disperse the mixture ultrasonically for 25 minutes at room temperature. Maintain the ultrasonic dispersion state and add 20g of 0.1M sodium hydroxide solution to the beaker. React for 50 minutes, filter, wash the filter cake with purified water until neutral, wash once with anhydrous ethanol, and transfer the filter cake to a drying oven at 75℃ to dry to constant weight to obtain modified fiber.

[0058] S5. Preparation of filter cloth material

[0059] Modified fibers are added to a twisting machine and twisted together using an S-twist method to prepare spun yarn;

[0060] Using a textile machine to weave spun yarns into textiles with a certain structure, width, and density;

[0061] The textile fabric is placed in a hot rolling mill at a temperature of 275°C for double-sided hot rolling for 13 minutes, and then cooled to room temperature to obtain the filter cloth material.

[0062] Example 3

[0063] This embodiment provides a method for preparing a filter cloth for deep dehydration and drying of gasified fine slag, including the following steps:

[0064] S1. Preparation of composite silicone resin

[0065] Weigh out 50g of hydrogen-containing silicone oil, 25g of 1-tetradecene, 10g of 3-butenyltriethoxysilane, and 100g of isopropanol and add them to a three-necked flask. Stir the mixture and raise the temperature of the three-necked flask to 85℃. Add 0.5g of chloroplatinic acid to the three-necked flask and keep the mixture at this temperature for 7 hours. Add 25g of ammonia water to the three-necked flask and keep the mixture at this temperature for 90 minutes. Add 0.1M hydrochloric acid to the three-necked flask to adjust the pH of the system to 7. Keep the temperature of the three-necked flask at 95℃ and remove low-boiling-point substances by vacuum distillation to obtain the composite silicone resin.

[0066] S2. Preparation of spinning solution

[0067] Weigh out 20g of p-phenylenediamine and 600g of N-methylpyrrolidone and add them to a three-necked flask. Stir until dissolved. Then add 60g of 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 40g of composite silicone resin to the three-necked flask and stir for 6 hours. Add 40g of triethylamine to the three-necked flask and stir for 60 minutes. Allow the mixture to stand under vacuum to remove bubbles and obtain the spinning solution.

[0068] S3, Preparation of spinning fibers

[0069] Acetic anhydride, triethylamine, and acetone were added to a beaker in a ratio of 3g:2g:40g and mixed thoroughly to obtain a molding solution.

[0070] The spinning solution was loaded into a syringe with a needle inner diameter of 0.6 mm. The spinning solution was extruded into a molding solution at a temperature of 20°C at an extrusion rate of 1 mL / min. After soaking for 10 h, the solution was removed from the molding solution, washed three times with acetone, and then transferred to a drying oven at a temperature of 300°C for 3 h of heat treatment to obtain spun fibers.

[0071] S4, Modified Spinning Fibers

[0072] Perfluorooctyltriethoxysilane, tetraethyl orthosilicate, and anhydrous ethanol were added to a beaker at a ratio of 1g:2g:10g and mixed thoroughly to obtain the modified solution.

[0073] Weigh 10g of spinning fiber and 100g of modification solution into a beaker. Disperse the mixture ultrasonically for 30 minutes at room temperature. Maintain the ultrasonic dispersion state and add 20g of 0.1M sodium hydroxide solution to the beaker. React for 60 minutes, filter, wash the filter cake with purified water until neutral, wash once with anhydrous ethanol, and transfer the filter cake to a drying oven at 70-80℃ to dry to constant weight to obtain modified fiber.

[0074] S5. Preparation of filter cloth material

[0075] Modified fibers are added to a twisting machine and twisted together using an S-twist method to prepare spun yarn;

[0076] Using a textile machine to weave spun yarns into textiles with a certain structure, width, and density;

[0077] The textile fabric is placed in a hot rolling mill at a temperature of 300°C for double-sided hot rolling for 15 minutes, and then cooled to room temperature to obtain filter cloth material.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that step S1 is omitted and composite silicone resin is not added in step S2.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that step S4 is omitted, and the modified fiber in step S5 is replaced with spun fiber.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 1 is that steps S1 and S4 are omitted, composite silicone resin is not added in step S2, and the modified fiber in step S5 is replaced with spun fiber.

[0084] The surface hydrophobicity, water absorption, high temperature resistance, mechanical strength, and abrasion resistance of the filter cloth materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested. Surface hydrophobicity was determined by measuring the static contact angle of water droplets on the sample surface according to standard DB44 / T1872-2016 "Determination of Wetting Properties of Textile Surfaces - Contact Angle Method". Water absorption, high temperature resistance, mechanical strength, and abrasion resistance were all tested according to standard JB / T 11092-2011 "Test Methods for Mechanical and Physical Properties of Woven Filter Cloths for Solid-Liquid Separation". Specific test results are shown in the table below:

[0085]

[0086] Data Analysis:

[0087] Comparative analysis of the data in the table above shows that the static contact angle between the filter cloth material prepared by this invention and water reaches 148°, and its mass change rate after immersion is only +15.8%, indicating that the filter cloth material prepared by this invention has excellent surface hydrophobic properties and poor water retention, which is beneficial for its use in the deep dehydration and drying process of gasification fine slag. The damage temperature of the filter cloth material prepared by this invention reaches 350.6℃, the tear strength reaches 330.2N, and the total number of friction cycles until damage reaches 9692, indicating that the filter cloth material prepared by this invention has high temperature resistance, friction resistance, and excellent mechanical properties. The various tests of Comparative Examples 1-3... The measured data differed from those of the examples, indicating that the present invention, by preparing spun fibers from a mixture of composite silicone resin and polyamide, and then modifying the surface of the spun fibers, can effectively improve the hydrophobicity, high temperature resistance, friction resistance, and mechanical properties of the filter cloth material. During the experiments on the filter cloth material, it was found that surface modification of the spun fibers can also effectively improve the surface stain resistance and chemical resistance of the filter cloth material. The filter cloth material prepared in the examples not only maintains good stability in corrosive environments, but also has low adhesion strength between the impurities attached to its surface and the filter cloth material surface, and the impurities attached to it can be removed by simple blowing, demonstrating good stain resistance.

[0088] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0089] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A filter cloth for deep dewatering and drying of gasified fine slag, characterized in that, It is obtained by the following steps: S1. Add hydrogen-containing silicone oil, 1-tetradecene, 3-butenyltriethoxysilane, and isopropanol to a three-necked flask and stir. Raise the temperature of the three-necked flask to 75-85℃, add a catalyst to the three-necked flask, and keep the reaction at this temperature for 5-7 hours. Add ammonia water to the three-necked flask and keep the reaction at this temperature for 60-90 minutes. After post-treatment, obtain the composite silicone resin. S2. Add p-phenylenediamine and N-methylpyrrolidone to a three-necked flask and stir until dissolved. Then add 3,3',4,4'-benzophenone tetracarboxylic dianhydride and composite silicone resin to the three-necked flask and stir for 5-6 hours. Add triethylamine to the three-necked flask and stir for 50-60 minutes. Allow the mixture to stand under vacuum to remove bubbles and obtain the spinning solution. S3. Load the spinning solution into a syringe with a needle inner diameter of 0.5-0.6 mm. Extrude the spinning solution into a molding solution at a temperature of 15-20℃ at an extrusion rate of 1 mL / min. Soak for 8-10 hours and then process to obtain spun fibers. S4. Add perfluorooctyltriethoxysilane, tetraethyl orthosilicate and anhydrous ethanol to a beaker at a ratio of 1g:2g:10g and mix well to obtain the modified solution. S5. Add the spinning fiber and the modification solution to a beaker, and ultrasonically disperse it for 20-30 minutes at room temperature. Then, while maintaining the ultrasonic dispersion, add 0.1M sodium hydroxide solution to the beaker and react for 40-60 minutes. After post-treatment, the modified fiber is obtained. S6. Add the modified fiber to the twisting machine and twist it into strands using the S-twist method to prepare spun yarn; S7. Use a textile machine to weave spun yarns into textiles with a certain structure, width and density; S8. Place the textile fabric in a hot rolling mill at a temperature of 250-300℃ for double-sided hot rolling for 10-15 minutes, and then cool it to room temperature to obtain the filter cloth material.

2. The gasification fine slag deep dewatering and drying filter cloth according to claim 1, characterized in that, In step S1, the ratio of hydrogen-containing silicone oil, 1-tetradecene, 3-butenyltriethoxysilane, isopropanol, catalyst, and ammonia is 10g:5g:2g:20g:0.1g:5g. The catalyst is chloroplatinic acid. The post-treatment operation includes: after the reaction is complete, adding 0.1M hydrochloric acid to a three-necked flask to adjust the pH of the system to 7, maintaining the temperature of the three-necked flask at 85-95℃, and removing low-boiling substances by vacuum distillation to obtain composite silicone resin.

3. The gasification fine slag deep dewatering and drying filter cloth according to claim 1, characterized in that, In step S2, the ratio of p-phenylenediamine, N-methylpyrrolidone, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, composite silicone resin, and triethylamine is 1g:30g:3g:2g:2g.

4. The gasification fine slag deep dewatering and drying filter cloth according to claim 1, characterized in that, In step S3, the molding solution is composed of acetic anhydride, triethylamine and acetone in a ratio of 3g:2g:40g. The post-treatment operation includes: after soaking, taking it out of the molding solution, washing it three times with acetone, and then transferring it to a drying oven at a temperature of 280-300℃ for 2-3 hours to obtain spun fibers.

5. The gasification fine slag deep dewatering and drying filter cloth according to claim 1, characterized in that, In step S5, the ratio of spinning fiber, modifying solution and 0.1M sodium hydroxide solution is 1g:10g:2g. The post-treatment operation includes: after the reaction is completed, filtration is performed, the filter cake is washed with purified water until neutral, then washed once with anhydrous ethanol, and the filter cake is transferred to a drying oven at a temperature of 70-80℃ and dried to constant weight to obtain modified fiber.

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