Processing technology of winding type metal porous filter cartridge

Abstract

The invention discloses a processing technology of a winding type metal porous filter cartridge, and belongs to the technical field of dedusting filter cartridge processing, and the processing technology comprises the following steps: placing an oxidized metal fiber felt in a reaction kettle at 80-100 DEG C, adding Ni (NO3) 2.9 H2O, urea and deionized water, generating a hydrotalcite film layer on the surface layer of the oxidized metal fiber felt by using an in-situ hydrothermal method, and drying the hydrotalcite film layer to obtain the winding type metal porous filter cartridge. The modified sealant with high elasticity, high water absorptivity and high durability is prepared by adding a modified adhesive into a silane-terminated polyether prepolymer, optimizing the filtering precision and the filtering efficiency, reacting the modified adhesive with a ferric chloride solution containing Fe < 3 + > to increase the bonding performance of the sealant, and performing enhanced modification on the silane-terminated polyether prepolymer through a filler, a catalyst and a plasticizer. And the problem that the coiled metal porous filter cartridge is easy to expand due to heating is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal filter cartridge processing, and in particular to a processing technology for a wound metal porous filter cartridge. Background Art

[0002] With the continuous advancement of industrial development, the demand for environmental purification is increasing, and more stringent requirements are also put forward for the emission limits of pollutants in the industry. How to improve the dust removal and purification effect has gradually become a hot topic of research in various industries. Conventional dust removal facilities are mainly based on bag dry dust removal and cyclone dust removal. Although bag dry dust removal has advantages in dust removal efficiency and application range, it has high maintenance costs, sensitivity to gas temperature and humidity, limited filtration efficiency, high energy consumption and other problems.

[0003] The wound metal porous filter cartridge dust removal is a type of bag dry dust removal. The wound metal porous filter cartridge is mostly made of metal materials, which can withstand the use in high temperature environments and is suitable for working conditions between 300℃ and 800℃. It can cope with high-temperature gases better than traditional bag dust removal systems, avoiding the failure of bag materials due to excessive temperature, and the corrosion resistance of metal materials is better than that of bag materials.

[0004] However, wound metal filter cartridges also have some shortcomings, such as the complex structure of metal filter cartridges and insufficient filtering accuracy. For some occasions that require more precise filtering, the pore size and design of the filter cartridge need to be specially optimized. Too small pores will lead to poor air permeability and pore blockage, making the bubble point pressure of the metal filter cartridge too high. Too large pores will lead to insufficient filtering accuracy and poor dust removal efficiency.

[0005] Moreover, although metal filter cartridges are resistant to high temperatures and corrosion, if their surfaces are subjected to external collisions or severe vibrations, the metal materials may be easily damaged or deformed, and their wear resistance is poor. In the case of high-temperature airflow, if there is no reasonable solidification support, the filter cartridges may be easily deformed by thermal expansion, thus reducing their service life.

[0006] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0007] The object of the present invention is to provide a processing technology for a wound metal porous filter cartridge, so as to solve the technical problem in the prior art that the filtering performance and mechanical strength of the wound metal porous filter cartridge need to be further improved.

[0008] The purpose of the present invention can be achieved by the following technical solution: A processing technology of a wound metal porous filter cartridge comprises the following steps:

[0009] S1. Place the oxidized metal fiber felt in a reactor at 80-100°C, add Ni(NO3)2·9H2O, urea and deionized water, keep the reaction for 20-24 hours, cool naturally, take out the sample and dry it to obtain a modified metal fiber felt;

[0010] S2, coating a modified adhesive on one side of the modified metal felt, and then adhering it to the outside of the porous filter cartridge skeleton, and after the modified adhesive is cured, a porous filter cartridge outer layer is formed on the outside of the porous filter cartridge skeleton to obtain a porous filter cartridge blank;

[0011] S3. A sealing bottom cover is sleeved on one end of the porous filter cartridge blank, and a modified sealant is injected into the gap between the porous filter cartridge blank and the sealing bottom cover, and cured to obtain a wound metal porous filter cartridge.

[0012] Furthermore, in step S1, the weight ratio of the oxidized metal fiber felt, Ni(NO3)2·9H2O, urea and deionized water is 10:1:2:200, and the thickness of the modified metal fiber felt is 2.0-5.0 mm; in step S2, the thickness of the modified metal fiber felt is 2.0-5.0 mm; in step S2, the coating amount of the modified adhesive is 80-100 g / m 2 The porous filter cartridge skeleton is a metal cylinder wound by porous metal and has a thickness of 0.3-1.0 mm.

[0013] Furthermore, the preparation method of the modified adhesive is: placing a polyethyleneimine solution in a reactor heated to 20-30°C, adding a mixed acid solution to adjust the pH to 4-5, reacting for 20-24 hours, adding sodium borohydride under ice bath conditions, returning to room temperature to react for 10-12 hours, and post-treating to obtain a modified adhesive.

[0014] Furthermore, the concentration of the polyethyleneimine solution is 0.05-0.1 mol / mL, the dosage ratio of the polyethyleneimine solution and sodium borohydride is 10 mL:2 g, the mixed acid solution is composed of 3,4-dihydroxybenzaldehyde, methanol, acetic acid and deionized water in a volume ratio of 10:1:2:200, and the post-treatment includes: adding hydrochloric acid solution to the reactor after room temperature reaction to adjust the pH to 3-5, filtering and drying, and dissolving the obtained solid in ferric chloride solution to obtain a modified adhesive.

[0015] The reaction equation for preparing the modified adhesive is:

[0016]

[0017] The reaction principle for preparing the modified adhesive is as follows: polyethyleneimine and 3,4-dihydroxybenzaldehyde form imine under acidic conditions, a catechol functional group is introduced into the side chain of polyethyleneimine, and the imine is reduced by sodium borohydride to generate a single bond to obtain a solid adhesive containing a catechol group in the side chain. After adding ferric chloride solution, Fe 3+ It can act as a metal center to coordinate with the catechol group, and also act as an oxidant to oxidize the catechol group to quinone for covalent crosslinking. 3+ The combination of these two effects enables the modified adhesive to form an effective cross-linked network.

[0018] Furthermore, the method for preparing the oxidized metal fiber felt comprises:

[0019] A1. Soak the metal fiber felt in an ethanol solution for 10 minutes, and wash it with deionized water, a dilute hydrochloric acid solution and deionized water for 1-2 times in sequence to obtain a crude metal fiber felt;

[0020] A2. Place the crude metal fiber felt in a reactor heated to 50-60°C, add potassium permanganate mixed solution and stir for 0.5h to obtain oxidized metal fiber felt.

[0021] Furthermore, in step A1, the metal fiber felt is composed of stainless steel fiber and iron-chromium-aluminum fiber in a weight ratio of 7:1, the concentration of the ethanol solution is 90-95%, and the concentration of the dilute hydrochloric acid solution is 6-10%. In step A2, the dosage ratio of the metal fiber felt crude product and the potassium permanganate mixed solution is 1g:10mL, and the potassium permanganate mixed solution is composed of potassium permanganate, nitric acid and deionized water in a dosage ratio of 4g:1g:30mL, and the concentration of nitric acid is 10%.

[0022] Furthermore, the preparation method of the modified sealant is: placing a dehydrated silane-terminated polyether prepolymer, vinyl trimethoxysilane and diisodecyl phthalate in a reaction kettle at 50-60°C, adding N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate, stirring for 5-10 minutes, and vacuum defoaming to obtain the modified sealant.

[0023] Furthermore, the weight ratio of the dehydrated silane-terminated polyether prepolymer, vinyl trimethoxysilane, diisodecyl phthalate, N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate is 100:25:20:2:0.5.

[0024] Furthermore, the preparation method of the dehydrated silane-terminated polyether prepolymer comprises:

[0025] B1. Place the polyether diol in a three-necked flask in a nitrogen atmosphere at 120-150° C., and dehydrate under a vacuum environment of 0.15-0.20 MPa until no bubbles appear in the reagent to obtain a dehydrated polyether diol;

[0026] B2, placing the dehydrated polyether diol in a reactor heated to 80-100° C. in a nitrogen atmosphere, adding isocyanate silane, keeping the temperature for reaction for 5 minutes, adding porous silica for post-treatment to obtain a silane-terminated polyether prepolymer;

[0027] B3. Place the silane-terminated polyether prepolymer, calcium carbonate, silicon dioxide and diisodecyl phthalate in a planetary stirred kettle at 80-100° C., increase the stirring rate to 100-200 r / min, keep stirring for 2-3 hours, and vacuum dehydrate to obtain a dehydrated silane-terminated polyether prepolymer.

[0028] Furthermore, in the step B2, the weight ratio of the dehydrated polyether diol, isocyanate silane and porous silica is 10.0:3.0:5.0; in the step B3, the weight ratio of the silane-terminated polyether prepolymer, calcium carbonate, silica and diisodecyl phthalate is 10.0:3.0:3.0:4.5.

[0029] The present invention has the following beneficial effects:

[0030] 1. The processing technology of the wound metal porous filter cartridge provided by the present invention comprises the following steps: in the production process, after the metal fiber felt is subjected to surface pretreatment, a potassium permanganate solution is added to obtain an oxidized metal fiber felt, and the oxidized metal fiber felt is reacted with Ni(NO3)2·9H2O and urea to form a hydrotalcite film layer on the surface, the coarse fiber is thickened, and the fine fiber layer is not blocked, which can effectively reduce the pore size of the filter cartridge and reduce the filtration accuracy; polyethyleneimine and 3,4-dihydroxybenzaldehyde are subjected to Schiff base reaction under the action of acid to generate a solid adhesive containing a catechol group in the side chain, and the solid adhesive is reacted with a Fe 3+ The ferric chloride solution is reacted to effectively increase the bonding performance of the modified adhesive; the polyether diol is dehydrated and reacted with the blocking catalyst isocyanate silane to generate a silane-terminated polyether prepolymer. The silane-terminated polyether prepolymer is added with fillers, catalysts and plasticizers to obtain a modified sealant with high elasticity, high water absorption and high durability.

[0031] 2. The processing technology of the wound metal porous filter cartridge provided by the present invention is to oxidize the metal fiber felt by potassium permanganate and nitric acid during the production process to obtain a surface containing Fe 3+The oxidized metal fiber felt, the oxidized fiber felt generates a layered composite hydroxide under the action of Ni(NO3)2·9H2O and urea, which thickens the coarse fiber layer but does not destroy the pore structure of the fine fiber layer. The porous filter cartridge blank punched and stretched with the modified metal fiber felt has a smaller pore size and can be designed according to demand, which can further reduce the filtration accuracy of the wound metal porous filter cartridge and improve the filtration efficiency. At the same time, reducing the blockage of the gaps can further increase the air permeability of the filter cartridge.

[0032] 3. The processing technology of the wound metal porous filter cartridge provided by the present invention comprises the following steps: in the production process, polyethyleneimine and 3,4-dihydroxybenzaldehyde are subjected to a Schiff base reaction under acidic conditions to generate a solid adhesive containing a catechol group in the side chain, and after adding a ferric chloride solution, Fe 3+ It can act as a metal center to coordinate with the catechol group, and also act as an oxidant to oxidize the catechol group to quinone for covalent crosslinking. 3+ The combination of these two effects can make the modified adhesive form an effective cross-linking network. When the modified adhesive is sprayed on the modified metal felt to form a film, catechol and Fe on the surface of the modified metal felt 3+ Coordination makes the metals stick firmly together, increasing the wear resistance and durability of the wound metal porous filter cartridge; polyether diols and isocyanate silanes are used to achieve end-capping, and silane-terminated polyether prepolymers are prepared. The prepolymers are used as the basis for preparing high-elasticity modified sealants. The prepared modified sealants have further improved toughness, elasticity and water absorption properties, increasing the wear resistance and structural stability of the wound metal porous filter cartridge. Good airtightness can reduce the bubble point pressure of the filter cartridge and achieve higher filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The schematic diagram is a partially cutaway structural diagram of a wound-type porous metal filter cartridge prepared in the present invention.

[0035] In the figure: 1. Porous filter cartridge frame; 2. Porous filter cartridge outer layer; 3. Sealed bottom cover. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] The present embodiment provides a process for processing a wound metal porous filter cartridge, comprising the following steps:

[0039] S1. Modified adhesive

[0040] Weigh: 200 mL of 3,4-dihydroxybenzaldehyde, 20 mL of methanol, 40 mL of acetic acid and 4 L of deionized water, mix well to obtain a mixed acid solution, set aside;

[0041] Weigh: 100 mL of polyethyleneimine solution is placed in a reactor heated to 20° C., mixed acid is added dropwise to adjust the pH to 4, and after reacting for 24 hours, 20 g of sodium borohydride is added in an ice bath, and the reaction is restored to room temperature for 12 hours. After the reaction at room temperature, hydrochloric acid solution is added dropwise to the reactor to adjust the pH to 5, filtered and dried, and the obtained solid adhesive is dissolved in ferric chloride solution to obtain a modified adhesive.

[0042] S2, porous filter cartridge blank

[0043] Weigh: 200 g of metal fiber felt and 2 L of ethanol are added into a reactor and soaked for 10 min, and then washed twice with deionized water, dilute hydrochloric acid and deionized water in sequence to obtain a crude metal fiber felt;

[0044] Weigh: 198 g of crude metal fiber felt and 2 L of potassium permanganate solution, add into a reaction kettle and stir for 0.5 h to obtain oxidized metal fiber felt;

[0045] Weigh: 212g of oxidized metal fiber felt, 21.2g of Ni(NO3)2·9H2O, 42.4g of urea and 4L of deionized water, put them into a reactor at 85°C, keep the temperature for reaction for 24h, take out the sample and dry it after natural cooling to obtain modified metal fiber felt;

[0046] Weigh: 230g of modified metal fiber felt and 100g of modified adhesive, apply the modified adhesive on one side of the modified metal felt, and then adhere it to the outside of the porous filter cartridge skeleton 1. After the modified adhesive is cured, a porous filter cartridge outer layer 2 is formed on the outside of the porous filter cartridge skeleton 1 to obtain a porous filter cartridge blank.

[0047] S3, modified sealant

[0048] Weigh: 50 g of polyether diol is placed in a three-necked flask at 125° C. in a nitrogen atmosphere, and dehydrated under a vacuum environment of 0.15 MPa until no bubbles appear in the reagent to obtain dehydrated polyether diol;

[0049] Weigh: 44 g of dehydrated polyether diol and 13.2 g of isocyanate silane are placed in a reactor heated to 90° C. in a nitrogen atmosphere, and reacted at this temperature for 5 min. 22 g of porous silica is added for post-treatment to obtain a silane-terminated polyether prepolymer;

[0050] Weigh: 60 g of silane-terminated polyether prepolymer, 18 g of calcium carbonate, 18 g of silicon dioxide and 27 g of diisodecyl phthalate, place in a planetary stirring kettle at 85° C., increase the stirring rate to 100 r / min, keep stirring for 2 h, and vacuum dehydrate to obtain a dehydrated silane-terminated polyether prepolymer;

[0051] Weigh: 95 g of dehydrated silane-terminated polyether prepolymer, 24 g of vinyl trimethoxysilane and 19 g of diisodecyl phthalate, place in a reactor at 55° C., add 5 g of N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate, stir for 5 min, and vacuum defoam to obtain a modified sealant.

[0052] S4. Preparation of wound metal porous filter cartridge

[0053] A sealing bottom cover 3 is sleeved on one end of the porous filter cartridge blank, and a modified sealant is injected into the gap between the porous filter cartridge blank and the sealing bottom cover 3, and cured to obtain a wound metal porous filter cartridge.

[0054] Example 2

[0055] A processing technology of a wound metal porous filter cartridge of this embodiment includes the following steps:

[0056] S1. Modified adhesive

[0057] Weigh: 210 mL of 3,4-dihydroxybenzaldehyde, 21 mL of methanol, 42 mL of acetic acid and 4.2 L of deionized water, mix well to obtain a mixed acid solution, set aside;

[0058] Weigh: 105 mL of polyethyleneimine solution is placed in a reactor heated to 20° C., mixed acid is added dropwise to adjust the pH to 4, and after reacting for 24 hours, 21 g of sodium borohydride is added in an ice bath, and the reaction is restored to room temperature for 12 hours. After the reaction at room temperature, hydrochloric acid solution is added dropwise to the reactor to adjust the pH to 5, filtered and dried, and the obtained solid adhesive is dissolved in ferric chloride solution to obtain a modified adhesive.

[0059] S2, porous filter cartridge blank

[0060] Weigh: 210 g of metal fiber felt and 2.1 L of ethanol, add them into a reactor and soak for 10 min, wash them twice with deionized water, dilute hydrochloric acid and deionized water in sequence to obtain a crude metal fiber felt;

[0061] Weigh: 201 g of crude metal fiber felt and 2.1 L of potassium permanganate solution, add into a reactor and stir for 0.5 h to obtain oxidized fiber felt;

[0062] Weigh: 219 g of oxidized fiber felt, 22 g of Ni(NO3)2·9H2O, 44 g of urea and 4.2 L of deionized water, place in a reactor at 85°C, keep warm for 24 hours, cool naturally, take out the sample and dry it to obtain modified metal fiber felt;

[0063] Weigh: 235g of modified metal fiber felt and 105g of modified adhesive, apply the modified adhesive on one side of the modified metal felt, and then adhere it to the outside of the porous filter cartridge skeleton 1. After the modified adhesive is cured, a porous filter cartridge outer layer 2 is formed on the outside of the porous filter cartridge skeleton 1 to obtain a porous filter cartridge blank.

[0064] S3, modified sealant

[0065] Weigh: 52.5 g of polyether diol is placed in a three-necked flask at 125° C. in a nitrogen atmosphere, and dehydrated under a vacuum environment of 0.15 MPa until no bubbles appear in the reagent, to obtain dehydrated polyether diol;

[0066] Weigh: 46 g of dehydrated polyether diol and 14 g of isocyanate silane are placed in a reactor heated to 90° C. in a nitrogen atmosphere, and reacted at this temperature for 5 minutes, and then 23 g of porous silica is added for post-treatment to obtain a silane-terminated polyether prepolymer;

[0067] Weigh: 63 g of silane-terminated polyether prepolymer, 19 g of calcium carbonate, 19 g of silicon dioxide and 28 g of diisodecyl phthalate, place in a planetary stirred kettle at 85° C., increase the stirring rate to 100 r / min, keep stirring for 2 h, and vacuum dehydrate to obtain a dehydrated silane-terminated polyether prepolymer;

[0068] Weigh: 95 g of dehydrated silane-terminated polyether prepolymer, 24 g of vinyl trimethoxysilane and 19 g of diisodecyl phthalate, place in a reactor at 55° C., add 6.1 g of N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate, stir for 5 min, and vacuum defoam to obtain a modified sealant.

[0069] S4. Preparation of wound metal porous filter cartridge

[0070] A sealing bottom cover 3 is sleeved on one end of the porous filter cartridge blank, and a modified sealant is injected into the gap between the porous filter cartridge blank and the sealing bottom cover 3, and cured to obtain a wound metal porous filter cartridge.

[0071] Example 3

[0072] The present embodiment provides a process for processing a wound metal porous filter cartridge, comprising the following steps:

[0073] S1. Modified adhesive

[0074] Weigh: 220 mL of 3,4-dihydroxybenzaldehyde, 22 mL of methanol, 44 mL of acetic acid and 4 L of deionized water, mix well to obtain a mixed acid solution, set aside;

[0075] Weigh: 100 mL of polyethyleneimine solution is placed in a reactor heated to 20° C., mixed acid is added dropwise to adjust the pH to 4, and after reacting for 24 hours, 22 g of sodium borohydride is added in an ice bath, and the reaction is restored to room temperature for 12 hours. After the reaction at room temperature, hydrochloric acid solution is added dropwise to the reactor to adjust the pH to 5, filtered and dried, and the obtained solid adhesive is dissolved in ferric chloride solution to obtain a modified adhesive.

[0076] S2, porous filter cartridge blank

[0077] Weigh: 220 g of metal fiber felt and 2.2 L of ethanol, add them into a reactor and soak for 10 min, wash them twice with deionized water, dilute hydrochloric acid and deionized water in sequence to obtain a crude metal fiber felt;

[0078] Weigh: 200 g of crude metal fiber felt and 2.3 L of potassium permanganate solution were added into a reactor and stirred for 0.5 h to obtain oxidized fiber felt;

[0079] Weigh: 212g of oxidized fiber felt, 23g of Ni(NO3)2·9H2O, 46g of urea and 4.2L of deionized water, place in a reactor at 85°C, keep warm for 24h, cool naturally, take out the sample and dry it to obtain modified metal fiber felt;

[0080] Weigh: 241g of modified metal fiber felt and 113g of modified adhesive, apply the modified adhesive on one side of the modified metal felt, and then adhere it to the outside of the porous filter cartridge skeleton 1. After the modified adhesive is cured, a porous filter cartridge outer layer 2 is formed on the outside of the porous filter cartridge skeleton 1 to obtain a porous filter cartridge blank.

[0081] S3, modified sealant

[0082] Weigh: 55 g of polyether diol is placed in a three-necked flask at 125° C. in a nitrogen atmosphere, and dehydrated under a vacuum environment of 0.15 MPa until no bubbles appear in the reagent to obtain dehydrated polyether diol;

[0083] Weigh: 45 g of dehydrated polyether diol and 13.9 g of isocyanate silane are placed in a reactor heated to 90° C. in a nitrogen atmosphere, and reacted at this temperature for 5 min. 24 g of porous silica is added for post-treatment to obtain a silane-terminated polyether prepolymer;

[0084] Weigh: 58 g of silane-terminated polyether prepolymer, 21 g of calcium carbonate, 21 g of silicon dioxide and 34 g of diisodecyl phthalate, place in a planetary stirred kettle at 85° C., increase the stirring rate to 100 r / min, keep stirring for 2 h, and vacuum dehydrate to obtain a dehydrated silane-terminated polyether prepolymer;

[0085] Weigh: 97 g of dehydrated silane-terminated polyether prepolymer, 24 g of vinyl trimethoxysilane and 22 g of diisodecyl phthalate, place in a reactor at 55° C., add 6.3 g of N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate, stir for 5 min, and vacuum defoam to obtain a modified sealant.

[0086] S4. Preparation of wound metal porous filter cartridge

[0087] A sealing bottom cover 3 is sleeved on one end of the porous filter cartridge blank, and a modified sealant is injected into the gap between the porous filter cartridge blank and the sealing bottom cover 3, and cured to obtain a wound metal porous filter cartridge.

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 3 is that step S1 is eliminated, and welding glue is used instead of the modified adhesive to participate in the synthesis reaction in step S4.

[0090] Comparative Example 2

[0091] The difference between this comparative example and Example 3 is that step S2 is eliminated, and a stainless steel mesh is used instead of the modified metal felt to participate in the synthesis reaction in step S4.

[0092] Comparative Example 3

[0093] The difference between this comparative example and Example 3 is that step S3 is eliminated and no modified sealant is added in step S4.

[0094] Performance Test:

[0095] The durability and service life of the wound metal porous filter cartridges prepared in Examples 1-3 and Comparative Examples 1-3 were tested, wherein the wear resistance was measured with reference to GB / T 12444-2006 "Metallic Material Wear Test Methods", and the filtration accuracy, bubble point pressure, and air permeability of the samples were measured with reference to the standard GB12625-1990 "Technical Requirements for Filter Materials and Filter Bags for Bag Dust Collectors". The specific test results are shown in Table 1 below:

[0096] Table 1-Performance test data of wound metal porous filter cartridge

[0097]

[0098] Data Analysis:

[0099] Comparative analysis of the data of Examples 1-3 and Comparative Examples 1-4 shows that the filtration accuracy of the wound metal porous filter cartridge prepared by the present invention reaches 20 μm, the bubble point pressure of the gas passing through the wet filter membrane is 8.9 MPa, the filtration efficiency reaches 99.8%, and the outlet dust concentration is 13 mg / cm 3 , air permeability reaches 22L / (dm 2 ·min), the values ​​are better than those of Comparative Examples 1-3, indicating that the wound metal porous filter cartridge manufactured by the present invention has good dust removal performance;

[0100] The filtration accuracy, bubble point pressure, filtration efficiency, outlet dust concentration and air permeability of comparative example 1 were all reduced, indicating that the modified adhesive can make the filter core layer of the wound metal porous filter cartridge tightly bonded, improve the strength and durability of the filter cartridge, and improve the filtration performance;

[0101] In comparative example 2, the filtration accuracy, bubble point pressure, filtration efficiency, outlet dust concentration and air permeability of the modified metal felt replaced by stainless steel mesh were all reduced, indicating that the modified metal felt prepared by oxidized metal fiber can effectively improve the filtration performance of the wound metal porous filter cartridge;

[0102] The bubble point pressure and air permeability of Example 3 decreased, indicating that the modified sealant can effectively improve the sealing of the filter cartridge, prevent gas leakage during the filtration process, and ensure the stability and filtration efficiency of the entire filtration process.

[0103] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A process for processing a wound metal porous filter cartridge, characterized in that: The following steps are involved: S1. Place the oxidized metal fiber felt in a reactor at 80-100°C, add Ni(NO3)2·9H2O, urea and deionized water, keep the reaction for 20-24 hours, cool naturally, take out the sample and dry it to obtain a modified metal fiber felt; S2, coating a modified adhesive on one side of the modified metal felt, and then adhering it to the outside of the porous filter cartridge skeleton (1), and after the modified adhesive is cured, a porous filter cartridge outer layer (2) is formed on the outside of the porous filter cartridge skeleton (1), thereby obtaining a porous filter cartridge blank; S3. A sealing bottom cover (3) is sleeved on one end of the porous filter cartridge blank, and a modified sealant is injected into the gap between the porous filter cartridge blank and the sealing bottom cover (3), and cured to obtain a wound metal porous filter cartridge.

2. The processing technology of a wound metal porous filter cartridge according to claim 1, characterized in that: In step S1, the weight ratio of the oxidized metal fiber felt, Ni(NO3)2·9H2O, urea and deionized water is 10:1:2:200, and the thickness of the modified metal fiber felt is 2.0-5.0 mm; in step S2, the coating amount of the modified adhesive is 80-100 g / m 2 The porous filter cartridge skeleton (1) is a metal cylinder formed by winding porous metal and has a thickness of 0.3-1.0 mm.

3. The processing technology of a wound metal porous filter cartridge according to claim 1, characterized in that: The preparation method of the modified adhesive is as follows: placing a polyethyleneimine solution in a reaction kettle heated to 20-30° C., dropping a mixed acid solution to adjust the pH to 4-5, reacting for 20-24 hours, adding sodium borohydride under ice bath conditions, returning to room temperature to react for 10-12 hours, and post-treating to obtain the modified adhesive.

4. The processing technology of a wound metal porous filter cartridge according to claim 3 is characterized in that: The concentration of the polyethyleneimine solution is 0.05-0.1 mol / mL, the dosage ratio of the polyethyleneimine solution to sodium borohydride is 10 mL:2 g, the mixed acid solution is composed of 3,4-dihydroxybenzaldehyde, methanol, acetic acid and deionized water in a volume ratio of 10:1:2:200, and the post-treatment comprises: adding hydrochloric acid solution dropwise to a reaction kettle after room temperature reaction to adjust the pH to 3-5, filtering and drying, and dissolving the obtained solid in a ferric chloride solution to obtain a modified adhesive.

5. The processing technology of a wound metal porous filter cartridge according to claim 1, characterized in that: The method for preparing the oxidized metal fiber felt comprises: A1. Soak the metal fiber felt in an ethanol solution for 10 minutes, and wash it with deionized water, a dilute hydrochloric acid solution and deionized water for 1-2 times in sequence to obtain a crude metal fiber felt; A2. Place the crude metal fiber felt in a reactor heated to 50-60°C, add potassium permanganate mixed solution and stir for 0.5h to obtain oxidized metal fiber felt.

6. The processing technology of a wound metal porous filter cartridge according to claim 5, characterized in that: In step A1, the metal fiber felt is composed of stainless steel fiber and iron-chromium-aluminum fiber in a weight ratio of 7:1, the concentration of the ethanol solution is 90-95%, and the concentration of the dilute hydrochloric acid solution is 6-10%; in step A2, the dosage ratio of the metal fiber felt crude product and the potassium permanganate mixed solution is 1g:10mL, the potassium permanganate mixed solution is composed of potassium permanganate, nitric acid and deionized water in a dosage ratio of 4g:1g:30mL, and the concentration of nitric acid is 10%.

7. The processing technology of a wound metal porous filter cartridge according to claim 1, characterized in that: The preparation method of the modified sealant is as follows: placing dehydrated silane-terminated polyether prepolymer, vinyl trimethoxysilane and diisodecyl phthalate in a reaction kettle at 50-60° C., adding N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate, stirring for 5-10 minutes, and vacuum defoaming to obtain the modified sealant.

8. The processing technology of a wound metal porous filter cartridge according to claim 7, characterized in that: The weight ratio of the dehydrated silane-terminated polyether prepolymer, vinyl trimethoxysilane, diisodecyl phthalate, N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and dibutyltin dilaurate is 100:25:20:2:0.

5.

9. The processing technology of a wound metal porous filter cartridge according to claim 7, characterized in that: The dehydrated silane-terminated polyether prepolymer is processed by the following steps: B1. Place the polyether diol in a three-necked flask in a nitrogen atmosphere at 120-150° C., and dehydrate under a vacuum environment of 0.15-0.20 MPa until no bubbles appear in the reagent to obtain a dehydrated polyether diol; B2, placing the dehydrated polyether diol in a reactor heated to 80-100° C. in a nitrogen atmosphere, adding isocyanate silane, keeping the temperature for reaction for 5 minutes, adding porous silica for post-treatment to obtain a silane-terminated polyether prepolymer; B3. Place the silane-terminated polyether prepolymer, calcium carbonate, silicon dioxide and diisodecyl phthalate in a planetary stirred kettle at 80-100° C., increase the stirring rate to 100-200 r / min, keep stirring for 2-3 hours, and vacuum dehydrate to obtain a dehydrated silane-terminated polyether prepolymer.

10. The processing technology of a wound metal porous filter cartridge according to claim 9, characterized in that: In step B2, the weight ratio of dehydrated polyether diol, isocyanate silane and porous silica is 10.0:3.0:5.0; in step B3, the weight ratio of silane-terminated polyether prepolymer, calcium carbonate, silica and diisodecyl phthalate is 10.0:3.0:3.0:4.5.

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