A dust collecting plate for a horizontal wet electric washing tower and a preparation method thereof

Abstract

The present invention provides a dust collecting plate for a horizontal wet electric power washing tower, which comprises a conductive anode plate composed of a plurality of conductive glass fiber reinforced plastic tubes arranged in a honeycomb pattern. The conductive glass fiber reinforced plastic tubes include inner and outer surface layers and a conductive glass fiber reinforced plastic layer located between the inner and outer surface layers. The inner surface is a carbon fiber surface felt, the outer surface layer is a glass fiber chopped strand felt, and the conductive glass fiber reinforced plastic layer is a glass fiber felt and glass fiber coarse sand impregnated with a modified flame retardant resin. The modified flame retardant resin is an epoxy resin derivative with a triazine skeleton structure, and has good self-extinguishing properties, heat resistance, and excellent mechanical properties. The resulting dust collecting plate has a smooth surface, is resistant to water flow impact and acid and alkali corrosion, and has a surface resistance of no more than 100Ω.

Description

Technical Field

[0001] The invention relates to a dust collecting plate material, in particular to a dust collecting plate for a horizontal wet electric power washing tower and a preparation method thereof. Background Art

[0002] With the development of industry worldwide, the expansion and renovation of power plants, steel mills, and chemical plants has led to flue gas emissions becoming a significant contributor to air pollution. As an advanced flue gas treatment technology, wet electrostatic precipitator (ESP) has been widely used in Europe, the United States, Japan, and other countries with excellent results. In recent years, with the upgrading of environmental protection standards, my country has also made rapid progress in the research and application of wet ESP. Carbon fiber conductive fiberglass anode tubes have emerged as a key player in this field, with their excellent performance and characteristics, earning them a strong position in this field and attracting the attention of numerous environmental design institutes and desulfurization and dust removal companies.

[0003] As a highly efficient flue gas deep purification device, wet electrostatic precipitator can effectively remove acid mist, gypsum rain, heavy metal mercury, sol, etc. in flue gas. The anode tube plays a vital role in its internal components. Since the working conditions in this field are mostly saturated wet flue gas with a temperature of 50-80℃, the flue gas contains SO2, NOx, Cl - 、F - Corrosive media such as lead and rigid PVC place high demands on the performance of anode tubes. Compared to commonly used anode tubes made of materials such as lead and rigid PVC, carbon fiber conductive fiberglass has the advantages of high strength, strong acid mist corrosion resistance, good rigidity, and resistance to deformation. In addition, the use of carbon fiber and resin with excellent corrosion resistance and high flame retardancy makes carbon fiber conductive fiberglass dust collecting plates an ideal material choice for wet electrostatic precipitator anodes.

[0004] According to the working conditions described above, the anode tube, as an important component of the dust collector, must meet the following performance requirements: strong corrosion resistance; good electrical conductivity; good flame retardant effect; high mechanical strength; good inner wall surface flatness and low operating water consumption; good dust collection effect; and long service life. Summary of the Invention

[0005] Based on the application status of conductive glass fiber reinforced plastic anode tubes in the prior art, the present invention provides a dust collecting plate for a horizontal wet power washing tower and a preparation method thereof. The dust collecting plate is a conductive glass fiber reinforced plastic anode plate containing a special flame retardant resin.

[0006] First, the present invention provides a dust collecting plate for a horizontal wet power scrubber. The plate comprises a conductive anode plate formed of a plurality of conductive fiberglass reinforced plastic (FRP) tubes arranged in a honeycomb pattern. The FRP tubes include inner and outer surface layers and a conductive FRP layer located between the inner and outer surface layers. The inner and outer surface layers are carbon fiber surface felt, and the conductive FRP layer is glass fiber felt and glass fiber grit impregnated with a modified flame-retardant resin. The modified flame-retardant resin comprises the following raw materials, by weight: 76-85% modified epoxy resin, 13-15% conductive filler, 2-2.5% curing agent, 0.7-1.1% non-cobalt accelerator, and 3-5% diluent.

[0007] In some embodiments of the present invention, the preparation process of the modified epoxy resin comprises the following steps:

[0008] S1: Add the catalyst and solvent to a reaction vessel, stir until completely dissolved, then add vanillin and hydroxylamine hydrochloride, continue stirring and heat to 120-140°C for 3-5 hours. After the reaction is complete, cool to room temperature, dilute the reaction system with dichloromethane and extract with distilled water. The resulting organic layer is evaporated to remove the solvent and dried to obtain intermediate product A.

[0009] S2: Add intermediate product A and dichloromethane to another reaction vessel and stir until completely dissolved; under an ice bath, add trifluoromethanesulfonic acid dropwise to the reaction vessel, stir to mix evenly, then raise the temperature to 20-30°C and stir again for 10-12 hours; after the reaction is complete, pour the mixture into ice water, neutralize with aqueous ammonia solution, filter, wash with distilled water, and dry to obtain intermediate product B;

[0010] S3: Add the intermediate product B and the epoxy halide to another reaction vessel, stir until completely dissolved, heat the system to 70-80°C, add a ring-opening catalyst, and react at this temperature for 3-5 hours; after the reaction is completed, cool to 40-50°C, add a strong base solution and continue to react for 3-5 hours; after the reaction is completed, cool naturally to room temperature, dilute with chloroform, extract with distilled water, and dry the obtained organic layer by rotary evaporation to obtain a modified epoxy monomer;

[0011] S4: The obtained modified epoxy monomer and epoxy resin are dissolved in chloroform at a mass ratio of 5-7:3-5, and a curing agent is added at a molar ratio of NH to epoxy group of 1:1. Ultrasonic treatment is performed for 30-40 minutes, and stirring is performed for 1-2 hours. After the solvent is evaporated at 50-60°C, the mixture is poured into a glass mold, placed in an oven for fixing and forming, and then hot-pressed and cold-pressed on a flat vulcanizer. Finally, the modified epoxy resin is completely cured in an oven to obtain the modified epoxy resin.

[0012] Furthermore, the catalyst in S1 is at least one of anhydrous ferric chloride, anhydrous aluminum chloride, zinc dichloride and titanium tetrachloride; the used mass accounts for 30-35% of the total mass of the vanillin and hydroxylamine hydrochloride; and the solvent is at least one of dimethylformamide, dimethylacetamide, N-methylpyrrolidone, acetone, and ethylene glycol monomethyl ether.

[0013] Furthermore, the molar ratio of vanillin to hydroxylamine hydrochloride in S1 is 1:1-1.5.

[0014] Furthermore, the mass of the trifluoromethanesulfonic acid added in S2 is 3-3.5 times the mass of the intermediate product A.

[0015] Furthermore, the epoxy haloalkane in S3 is at least one of epichlorohydrin, methyl epichlorohydrin, 2-(chloromethyl)-1,2-epoxybutane, 1,2-epoxychlorobutane, methyl epichlorobutane, 1,2-epoxychloropentane (CAS: 19141-74-3), and 1,1-dimethyl-1,2-epoxychloropentane (CAS: 408319-88-0).

[0016] Furthermore, the mass of the added epoxyhaloalkane in S3 is 5-6 times the mass of the intermediate product B.

[0017] Furthermore, the ring-opening catalyst in S3 is one of tetrabutylammonium bromide, ammonium chloride, ammonium bisulfate, trioctylmethylammonium chloride, and dodecyltrimethylammonium chloride, and the added mass is 2-3% of the total mass of the intermediate product B and the epoxy haloalkane.

[0018] The preparation principle of the modified epoxy monomer described above is as shown in Formula I:

[0019] ,

[0020] Formula I

[0021] Wherein R is an alkylene oxide.

[0022] The method for preparing the dust collecting plate for the horizontal wet electric scrubber described above comprises the following steps:

[0023] Step 1: Preparation of resin impregnation liquid: After melting the modified flame retardant resin, a conductive filler, a non-cobalt accelerator, a curing agent, and a diluent are sequentially added thereto to obtain a modified flame retardant resin impregnation liquid; each component must be thoroughly mixed with the modified epoxy resin before adding the next component;

[0024] Step 2: Use hand lay-up process to press 30g / m3 on the anode tube mold. 2 The requirements of the two layers of carbon fiber surface felt are evenly coated, and then the surface of the carbon fiber surface felt is coated with 450g / m 2A layer of glass fiber mat and glass fiber coarse sand containing modified flame retardant resin is evenly coated on the conductive glass fiber reinforced plastic layer; a layer of glass fiber chopped strand mat is evenly coated on the surface of the obtained conductive glass fiber reinforced plastic layer, and finally an anode tube wall plate with a thickness of 1.8-2 mm is formed;

[0025] Step 3: Assemble the dust collecting tube according to the use requirements to obtain the dust collecting plate.

[0026] Furthermore, in step three, when assembling the dust collecting tubes, first scrape a layer of a mixture of light powder, crushed glass fiber and modified flame retardant resin on the side of a single dust collecting tube, and at the same time scrape a layer on the side of another dust collecting tube. Finally, the two dust collecting tubes are pressed tightly together, and the remaining dust collecting tubes are assembled in the same way, and finally assembled into several dust collecting tubes as a whole; among them, the last dust collecting tube is assembled and hardened for 2 hours, and then left to stand for at least 2 hours.

[0027] Beneficial effects: Compared with the prior art, the present invention adds a fully bio-based triazine epoxy monomer prepared by using vanillin to the resin impregnated with the carbon fiber felt on the inner and outer surfaces of the dust collecting tube. The prepared modified flame retardant resin contains triazine rings and benzene rings, has a strong polar NH, and is beneficial to improving the mechanical properties of the modified flame retardant resin; in addition, the non-combustible gas generated by the modified flame retardant resin when decomposed by heat can form a protective layer on the surface of the material, to a certain extent isolate the air, block the diffusion of oxygen to the surface of the material, and have a certain inhibitory effect on the thermal oxygen decomposition of the material; in addition, these non-combustible gases can dilute the concentration of flammable small molecules and oxygen after diffusing to the flame zone, and reduce the temperature of the flame zone to a certain extent, and the reduction in the temperature of the gas phase reaction zone is of great help to the reduction in the temperature of the condensed phase thermal decomposition zone, so that the modified flame retardant resin has good self-extinguishing and heat resistance. Since there is no ester group on the modified flame retardant resin skeleton and both sides of the molecular chain are protected by alkyl groups, it exhibits good acid and alkali resistance; due to the certain electron carrier characteristics of the triazine ring and the conjugated structure of the benzene ring, the surface resistance of the final dust collecting plate is less than 100Ω. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The following is an exemplary description of the preparation process of the modified epoxy resin used in the examples:

[0030] Modified epoxy resin #1

[0031] S1: Add 6.65 g of anhydrous ferric chloride and 100 ml of DMF to a three-necked flask and stir until completely dissolved. Then, add 15.2 g (0.1 mol) of vanillin and 6.95 g (0.1 mol) of hydroxylamine hydrochloride. Stir continuously and heat to 120°C for 5 h. After the reaction is complete, cool to room temperature, dilute the reaction system with dichloromethane and extract three times with distilled water. Dry the resulting organic layer over sodium persulfate overnight, remove the solvent by rotary evaporation, and finally dry in a vacuum oven at 60°C overnight to obtain intermediate product A with a yield of 73.5%.

[0032] S2: 16.0 g of intermediate product A and 300 ml of dichloromethane were added to another three-necked flask and stirred until completely dissolved. Under an ice bath, 48.0 g of trifluoromethanesulfonic acid was added dropwise to the reaction vessel, stirred and mixed evenly, then heated to 20°C and stirred again for 12 h. After the reaction was completed, the mixture was poured into ice water, neutralized with 0.1 mol / L ammonia solution, filtered, washed three times with distilled water, and dried to obtain intermediate product B with a yield of 60.5%;

[0033] S3: 10.7 g of intermediate product B and 53.5 g of epichlorohydrin were added to another three-necked flask and stirred until completely dissolved. The system was then heated to 70°C, 1.28 g of tetrabutylammonium bromide as a ring-opening catalyst was added, and the reaction was continued at this temperature for 5 h. After the reaction was completed, the temperature was lowered to 40°C, 7.5 g of 30 wt% NaOH solution was added dropwise, and the reaction was continued for 3 h. After the reaction was completed, the mixture was naturally cooled to room temperature, diluted with chloroform, and extracted three times with distilled water. The obtained organic layer was dried over anhydrous sodium sulfate overnight, filtered, and then evaporated to remove epichlorohydrin and chloroform. Finally, the mixture was dried in a vacuum oven at 50°C overnight to obtain a modified epoxy monomer with a yield of 76.9%.

[0034] S4: The obtained modified epoxy monomer and epoxy resin (915, purchased from Shangwei Shanghai Fine Chemical Co., Ltd.) were dissolved in chloroform at a mass ratio of 5:5, and the curing agent 4,4'-diaminodiphenylmethane was added at a molar ratio of NH to epoxy group of 1:1. Ultrasonic treatment was performed for 30 minutes and stirring was performed for 1 hour. After the solvent was evaporated at 50°C, the mixture was poured into a glass mold and placed in an oven for fixed molding. The mold was then subjected to post-hot pressing and cold pressing on a flat vulcanizer. Finally, the mold was completely cured in an oven to obtain the modified epoxy resin #1.

[0035] Modified epoxy resin #2

[0036] S1: Add 7.53 g of anhydrous aluminum trichloride and 100 ml of N-methylpyrrolidone to a three-necked flask and stir until completely dissolved. Then, add 15.2 g (0.1 mol) of vanillin and 8.34 g (0.12 mol) of hydroxylamine hydrochloride. Stir continuously and heat to 130°C for 4 h. After the reaction is complete, cool to room temperature, dilute the reaction system with dichloromethane and extract three times with distilled water. Dry the resulting organic layer over sodium persulfate overnight, remove the solvent by rotary evaporation, and finally dry in a vacuum oven at 60°C overnight to obtain intermediate A with a yield of 71.7%.

[0037] S2: 16.0 g of intermediate product A and 300 ml of dichloromethane were added to another three-necked flask and stirred until completely dissolved. Under an ice bath, 51.2 g of trifluoromethanesulfonic acid was added dropwise to the reaction vessel, stirred and mixed evenly, then heated to 25°C and stirred again for 11 h. After the reaction was completed, the mixture was poured into ice water, neutralized with 0.1 mol / L ammonia solution, filtered, washed three times with distilled water, and dried to obtain intermediate product B with a yield of 62.1%;

[0038] S3: Add 21.7 g of intermediate product B and 119.35 g of 2-(chloromethyl)-1,2-epoxybutane to another three-necked flask and stir until completely dissolved. Then, heat the system to 75°C, add 3.53 g of ring-opening catalyst ammonium bisulfate, and react at this temperature for 4 hours. After the reaction is completed, cool to 45°C, add 35 wt% NaOH solution (7.2 g) dropwise, and continue to react for 4 hours. After the reaction is completed, cool naturally to room temperature, dilute with chloroform, and extract three times with distilled water. The obtained organic layer is dried over anhydrous sodium sulfate overnight, filtered, and then evaporated to remove epichlorohydrin and chloroform. Finally, dry in a vacuum oven at 50°C overnight to obtain the modified epoxy monomer with a yield of 75.4%.

[0039] S4: The obtained modified epoxy monomer and epoxy resin (915, purchased from Shangwei Shanghai Fine Chemical Co., Ltd.) were dissolved in chloroform at a mass ratio of 6:4, and the curing agent 4,4'-diaminodiphenylmethane was added at a molar ratio of NH to epoxy group of 1:1. Ultrasonic treatment was performed for 35 minutes and stirring was performed for 1.5 hours. After the solvent was evaporated at 55°C, the mixture was poured into a glass mold and placed in an oven for fixed molding. The mold was then subjected to post-hot pressing and cold pressing on a flat vulcanizer. Finally, the mold was completely cured in an oven to obtain the modified epoxy resin #2.

[0040] Modified epoxy resin #3

[0041] S1: Add 8.97 g of anhydrous zinc dichloride and 100 ml of ethylene glycol monomethyl ether to a three-necked flask and stir until completely dissolved. Then, add 15.2 g (0.1 mol) of vanillin and 10.43 g (0.15 mol) of hydroxylamine hydrochloride. Stir continuously and heat to 140°C for 3 h. After the reaction is complete, cool to room temperature, dilute the reaction system with dichloromethane, and extract three times with distilled water. Dry the resulting organic layer over sodium persulfate overnight, remove the solvent by rotary evaporation, and finally dry in a vacuum oven at 60°C overnight to obtain intermediate product A with a yield of 73.5%.

[0042] S2: 16.0 g of intermediate product A and 300 ml of dichloromethane were added to another three-necked flask and stirred until completely dissolved. Under an ice bath, 56 g of trifluoromethanesulfonic acid was added dropwise to the reaction vessel, stirred and mixed evenly, then heated to 30°C and stirred again for 10 h. After the reaction was completed, the mixture was poured into ice water, neutralized with 0.1 mol / L ammonia solution, filtered, washed three times with distilled water, and dried to obtain intermediate product B with a yield of 65.3%;

[0043] S3: 23.5 g of intermediate product B and 141 g of 1,2-epoxychloropropane were added to another three-necked flask and stirred until completely dissolved. The system was then heated to 80°C, 4.94 g of the ring-opening catalyst trioctylmethylammonium chloride was added, and the reaction was continued at this temperature for 3 h. After the reaction was completed, the temperature was lowered to 50°C, and 40 wt% NaOH solution (7.0 g) was added dropwise and the reaction was continued for 5 h. After the reaction was completed, the mixture was naturally cooled to room temperature, diluted with chloroform, and extracted three times with distilled water. The obtained organic layer was dried over anhydrous sodium sulfate overnight, filtered, and then evaporated to remove epichlorohydrin and chloroform. Finally, the modified epoxy monomer was dried in a vacuum oven at 50°C overnight with a yield of 72.6%.

[0044] S4: The obtained modified epoxy monomer and epoxy resin (915, purchased from Shangwei Shanghai Fine Chemical Co., Ltd.) were dissolved in chloroform at a mass ratio of 7:3, and the curing agent 4,4'-diaminodiphenylmethane was added at a molar ratio of NH to epoxy group of 1:1. Ultrasonic treatment was performed for 40 minutes and stirring was performed for 2 hours. After the solvent was evaporated at 60°C, the mixture was poured into a glass mold and placed in an oven for fixed molding. The mold was then subjected to post-hot pressing and cold pressing on a flat vulcanizer. Finally, the mold was completely cured in an oven to obtain the modified epoxy resin #3.

[0045] Modified epoxy resin #4

[0046] Same as modified epoxy resin #3, except that the mass ratio of modified epoxy monomer to epoxy resin is 8:2.

[0047] The conductive filler used in the following examples is carbon powder (purchased from Shanghai Huigang Graphite Co., Ltd.), the non-cobalt accelerator used is 1305 and / or 1336 (purchased from Shangwei Shanghai Fine Chemical Co., Ltd.), the curing agent used is V388 (purchased from Akzo Nobel Chemical Co., Ltd.), the carbon fiber surface felt used is purchased from Kaifeng Pengyuan Glass Fiber Products Co., Ltd., the glass fiber chopped strand mat used is purchased from Shandong Taishan Glass Fiber Co., Ltd., and the diluent used is purchased from Changzhou Fuqiao Resin Co., Ltd.

[0048] Example 1

[0049] Step 1: Prepare the resin impregnation solution: After melting 81.3% modified epoxy resin #1, add 13% carbon powder, 0.7% non-cobalt accelerator, 2% curing agent, and 5% diluent to the melt to obtain a modified flame-retardant resin impregnation solution. Each component must be thoroughly mixed with the modified epoxy resin before adding the next component.

[0050] Step 2: Use hand lay-up process to press 30g / m3 on the anode tube mold. 2 The requirements of the two layers of carbon fiber surface felt are evenly coated, and then the surface of the carbon fiber surface felt is coated with 450g / m 2 A layer of glass fiber mat and glass fiber coarse sand containing modified flame retardant resin is uniformly coated on the surface of the conductive glass fiber reinforced plastic layer; a layer of glass fiber chopped strand mat is uniformly coated on the surface of the obtained conductive glass fiber reinforced plastic layer, and finally an anode tube wall plate with a thickness of 1.8 mm is formed;

[0051] Step 3: Assemble the dust collecting tubes according to the requirements of use. When assembling the dust collecting tubes, first scrape a layer of a mixture of light powder, crushed glass fiber and modified flame retardant resin on the side of a single dust collecting tube, and at the same time scrape a layer on the side of another dust collecting tube. Finally, press the two dust collecting tubes tightly together and assemble the remaining dust collecting tubes in the same way. Finally, assemble several dust collecting tubes as a whole. Among them, after the last dust collecting tube is assembled and hardened for 2 hours, it is left to stand for at least 2 hours to obtain the dust collecting plate.

[0052] Example 2

[0053] Step 1: Prepare the resin impregnation solution: After melting 78.8% modified epoxy resin #2, add 14% carbon powder, 1% non-cobalt accelerator, 2.3% curing agent, and 4% diluent to the melt to obtain a modified flame-retardant resin impregnation solution. Each component must be thoroughly mixed with the modified epoxy resin before adding the next component.

[0054] Step 2: Use hand lay-up process to press 30g / m3 on the anode tube mold. 2 The requirements of the two layers of carbon fiber surface felt are evenly coated, and then the surface of the carbon fiber surface felt is coated with 450g / m 2A layer of glass fiber mat and glass fiber coarse sand containing modified flame retardant resin is uniformly coated on the surface of the conductive glass fiber reinforced plastic layer; a layer of glass fiber chopped strand mat is uniformly coated on the surface of the obtained conductive glass fiber reinforced plastic layer, and finally a 1.9 mm thick anode tube wall plate is formed;

[0055] Step 3: Assemble the dust collecting tubes according to the requirements of use. When assembling the dust collecting tubes, first scrape a layer of a mixture of light powder, crushed glass fiber and modified flame retardant resin on the side of a single dust collecting tube, and at the same time scrape a layer on the side of another dust collecting tube. Finally, press the two dust collecting tubes tightly together and assemble the remaining dust collecting tubes in the same way. Finally, assemble several dust collecting tubes as a whole. Among them, after the last dust collecting tube is assembled and hardened for 2 hours, it is left to stand for at least 2 hours to obtain the dust collecting plate.

[0056] Example 3

[0057] Step 1: Prepare the resin impregnation solution: After melting 78.4% modified epoxy resin #3, add 15% carbon powder, 1.1% non-cobalt accelerator, 2.5% curing agent, and 3% diluent to the melt to obtain a modified flame-retardant resin impregnation solution. Each component must be thoroughly mixed with the modified epoxy resin before adding the next component.

[0058] Step 2: Use hand lay-up process to press 30g / m3 on the anode tube mold. 2 The requirements of the two layers of carbon fiber surface felt are evenly coated, and then the surface of the carbon fiber surface felt is coated with 450g / m 2 A layer of glass fiber mat and glass fiber coarse sand containing modified flame retardant resin is uniformly coated on the surface of the conductive glass fiber reinforced plastic layer; a layer of glass fiber chopped strand mat is uniformly coated on the surface of the obtained conductive glass fiber reinforced plastic layer, and finally a 2.0 mm thick anode tube wall plate is formed;

[0059] Step 3: Assemble the dust collecting tubes according to the requirements of use. When assembling the dust collecting tubes, first scrape a layer of a mixture of light powder, crushed glass fiber and modified flame retardant resin on the side of a single dust collecting tube, and at the same time scrape a layer on the side of another dust collecting tube. Finally, press the two dust collecting tubes tightly together and assemble the remaining dust collecting tubes in the same way. Finally, assemble several dust collecting tubes as a whole. Among them, after the last dust collecting tube is assembled and hardened for 2 hours, it is left to stand for at least 2 hours to obtain the dust collecting plate.

[0060] Example 4

[0061] Same as Example 3, except that modified epoxy resin #3 is replaced by modified epoxy resin #4.

[0062] Comparative Example 1

[0063] Same as Example 3, except that epoxy resin (915, purchased from Shanghai Shangwei Fine Chemical Co., Ltd.) was used instead of modified epoxy resin #3.

[0064] In the above embodiments and comparative examples, when assembling a single dust collection tube, first clean the mold. Then, place the pre-laminated dust collection tube (2*2*2*2) into the mold. Tube specifications can be adjusted based on actual conditions (choose tubes of consistent thickness pressed together). Cut 2 cm off each side of the tube at the break. Secure the mold with tie wrap and wooden planks. Apply two layers of carbon fiber and one layer of glass fiber at the break, then finish after hardening.

[0065] When the dust collection pipe is assembled, fill the gaps with shredded fiberglass and resin. After hardening, smooth the surface. This process takes about six hours. Once fully hardened, lift the dust collection pipe using two cranes. Fill the lower corners with resin and shredded fiberglass. After hardening, smooth the surface. This completes the dust collection pipe assembly.

[0066] The thickness after assembly is 5-6mm, the roughness of the inner surface is less than Ra12.5, and the roughness of the outer surface is less than Ra100.

[0067] Performance Testing

[0068] Surface resistance: Use AMC72-DI / MC embedded DC ammeter to detect;

[0069] Barcol hardness: measured in accordance with GB / T3854-2005;

[0070] Resin heat deformation temperature: measured in accordance with GB / T1634.3-2004;

[0071] Tensile strength: measured in accordance with GB / T1447-2005;

[0072] Bending strength: measured in accordance with GB / T1449-2005;

[0073] Oxygen index: measured in accordance with GB / T8924-2005.

[0074] The test results are detailed in Table 1:

[0075] Table 1 Test results of the dust collecting plates or their surface resins obtained in Examples 1-4 and Comparative Example 1

[0076]

[0077] It can be seen from the data in Table 1 that when the mass ratio of the modified epoxy monomer to the epoxy resin in the modified epoxy resin is changed (exceeding the range of 5-7:3-5), the heat deformation temperature, mechanical properties and flame retardancy of the modified flame retardant resin obtained will not increase, but will be slightly weakened; when the modified epoxy monomer is not added to prepare the modified flame retardant resin, the various properties of the obtained resin are reduced, which shows the importance of the modified epoxy monomer for improving the surface resin performance of the dust collecting plate.

Claims

1. A dust collecting plate for a horizontal wet power scrubber, comprising a conductive anode plate composed of a plurality of conductive glass fiber reinforced plastic tubes arranged in a honeycomb pattern, wherein the conductive glass fiber reinforced plastic tubes include inner and outer surface layers and a conductive glass fiber reinforced plastic layer located between the inner and outer surface layers; characterized in that: The inner and outer surface layers are carbon fiber surface felts impregnated with a modified flame retardant resin. The modified flame retardant resin comprises the following raw materials by weight: 76-85% modified epoxy resin, 13-15% conductive filler, 2-2.5% curing agent, 0.7-1.1% non-cobalt accelerator, and 3-5% diluent. The preparation process of the modified epoxy resin comprises the following steps: S1: Add the catalyst and solvent to a reaction vessel, stir until completely dissolved, then add vanillin and hydroxylamine hydrochloride, continue stirring and heat to 120-140°C for 3-5 hours. After the reaction is complete, cool to room temperature, dilute the reaction system with dichloromethane and extract with distilled water. The resulting organic layer is evaporated to remove the solvent and dried to obtain intermediate product A. S2: Add intermediate product A and dichloromethane to another reaction vessel and stir until completely dissolved; under an ice bath, add trifluoromethanesulfonic acid dropwise to the reaction vessel, stir to mix evenly, then raise the temperature to 20-30°C and stir again for 10-12 hours; after the reaction is complete, pour the mixture into ice water, neutralize with aqueous ammonia solution, filter, wash with distilled water, and dry to obtain intermediate product B; S3: Add the intermediate product B and the epoxy halide to another reaction vessel, stir until completely dissolved, heat the system to 70-80°C, add a ring-opening catalyst, and react at this temperature for 3-5 hours; after the reaction is completed, cool to 40-50°C, add a strong base solution and continue to react for 3-5 hours; after the reaction is completed, cool naturally to room temperature, dilute with chloroform, extract with distilled water, and dry the obtained organic layer by rotary evaporation to obtain a modified epoxy monomer; S4: The obtained modified epoxy monomer and epoxy resin are dissolved in chloroform at a mass ratio of 5-7:3-5, and a curing agent is added at a molar ratio of NH to epoxy group of 1:

1. Ultrasonic treatment is performed for 30-40 minutes, and stirring is performed for 1-2 hours. After the solvent is evaporated at 50-60°C, the mixture is poured into a glass mold, placed in an oven for fixing and forming, and then hot-pressed and cold-pressed on a flat vulcanizer. Finally, the modified epoxy resin is completely cured in an oven to obtain the modified epoxy resin.

2. The dust collecting plate for a horizontal wet electric power scrubber according to claim 1, characterized in that: The catalyst in S1 is at least one of anhydrous ferric chloride, anhydrous aluminum chloride, zinc dichloride and titanium tetrachloride; the used mass accounts for 30-35% of the total mass of the vanillin and hydroxylamine hydrochloride; the solvent is at least one of dimethylformamide, dimethylacetamide, N-methylpyrrolidone, acetone, and ethylene glycol monomethyl ether.

3. The dust collecting plate for a horizontal wet electric power scrubber according to claim 1, characterized in that: The molar ratio of vanillin to hydroxylamine hydrochloride in S1 is 1:1-1.

5.

4. The dust collecting plate for a horizontal wet electric power scrubber according to claim 1, characterized in that: The mass of the trifluoromethanesulfonic acid added in S2 is 3-3.5 times the mass of the intermediate product A.

5. The dust collecting plate for a horizontal wet electric power scrubber according to claim 1, characterized in that: The epoxy haloalkane in S3 is at least one of epichlorohydrin, methyl epichlorohydrin, 2-(chloromethyl)-1,2-epoxybutane, 1,2-epoxychlorobutane, methyl epichlorobutane, 1,2-epoxychloropentane, and 1,1-dimethyl-1,2-epoxychloropentane.

6. The dust collecting plate for a horizontal wet electric power scrubber according to claim 1, characterized in that: The added mass of the epoxyhaloalkane in S3 is 5-6 times the mass of the intermediate product B.

7. The dust collecting plate for a horizontal wet electric power scrubber according to claim 1, characterized in that: The ring-opening catalyst in S3 is one of tetrabutylammonium bromide, ammonium chloride, ammonium bisulfate, trioctylmethylammonium chloride, and dodecyltrimethylammonium chloride, and the added mass is 2-3% of the total mass of the intermediate product B and the epoxy haloalkane.

8. The method for preparing the dust collecting plate for a horizontal wet electric power scrubber according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Preparation of resin impregnation liquid: After melting the modified epoxy resin, a conductive filler, a non-cobalt accelerator, a curing agent, and a diluent are sequentially added thereto to obtain a modified flame retardant resin impregnation liquid; each component must be thoroughly mixed with the modified epoxy resin before adding the next component; Step 2: Use hand lay-up process to press 30g / m3 on the anode tube mold. 2 The requirements of the two layers of carbon fiber surface felt are evenly coated, and then the surface of the carbon fiber surface felt is coated with 450g / m 2 A layer of glass fiber mat and glass fiber coarse sand containing modified flame retardant resin is evenly coated on the conductive glass fiber reinforced plastic layer; a layer of glass fiber chopped strand mat is evenly coated on the surface of the obtained conductive glass fiber reinforced plastic layer, and finally an anode tube wall plate with a thickness of 1.8-2 mm is formed; Step 3: Assemble the dust collecting tube according to the use requirements to obtain the dust collecting plate.

9. The method for preparing a dust collecting plate for a horizontal wet electric power scrubber according to claim 8, characterized in that: In step three, when assembling the dust collecting tubes, first scrape a layer of a mixture of light powder, chopped glass fiber and modified flame retardant resin on the side of a single dust collecting tube, and also scrape a layer on the side of another dust collecting tube. Finally, press the two dust collecting tubes tightly together, and assemble the remaining dust collecting tubes in the same way. Finally, assemble several dust collecting tubes as a whole; among them, the last dust collecting tube is assembled and hardened for 2 hours, and then left to stand for at least 2 hours.

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