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CN-121130519-B - Water-jet filter material for filter cartridge and preparation method thereof

CN121130519BCN 121130519 BCN121130519 BCN 121130519BCN-121130519-B

Abstract

The invention relates to the technical field of industrial filter materials, in particular to a water-jet filter material for a filter cartridge and a preparation method thereof, comprising the following steps of S1, respectively opening and mixing modified polytetrafluoroethylene fibers and polyester fibers to obtain mixed fibers, and carding, lapping, grid connection and pre-needling the mixed fibers to obtain a pre-needled felt; S3, after singeing treatment is carried out on the surface of the filter material element felt, the filter material element felt is immersed in finishing liquid, and the immersed filter material element felt is subjected to liquid rolling and drying to obtain the filter material for the filter cartridge by water thorn. According to the invention, through the chemical crosslinking of the epoxy groups introduced on the surface of the modified polytetrafluoroethylene fiber and the amino groups on the surface of the modified silicon dioxide and the impregnation technology of the finishing liquid, the comprehensive improvement of the flame retardant property, the corrosion resistance and the filtering efficiency of the water-jet filter material for the filter cartridge is realized.

Inventors

  • GU HANBIN
  • PENG XIAOHUI
  • XU TING
  • CHEN JUN
  • DONG WEIXING

Assignees

  • 华基环保(武汉)有限公司

Dates

Publication Date
20260512
Application Date
20250911

Claims (7)

  1. 1. The preparation method of the water-jet filter material for the filter cartridge is characterized by comprising the following steps of: S1, respectively opening and mixing the modified polytetrafluoroethylene fibers and the polyester fibers to obtain mixed fibers, and carding, lapping, grid connection and pre-needling the mixed fibers to obtain a pre-needled felt; s2, carrying out water jet reinforcement and drying shaping on the pre-needled felt to obtain a filter material plain felt; S3, after singeing treatment is carried out on the surface of the filter material plain felt, immersing the filter material plain felt in finishing liquid, and carrying out liquid rolling and drying on the immersed filter material plain felt to obtain a water-jet filter material for the filter cartridge; the finishing liquid comprises, by weight, 8-15 parts of triphenyl phosphate, 3-8 parts of modified silicon dioxide, 8-10 parts of melamine polyphosphate and 100-200 parts of deionized water; The preparation method of the modified silicon dioxide comprises the following steps: (1) Dissolving 1-methylbenzotriazole-5-carboxylic acid in DMF, adding 3- (N-allylamino) propyl trimethoxy silane and N, N' -dicyclohexylcarbodiimide, and reacting for 6-8 hours at 80-100 ℃ to generate a modifier; (2) Dispersing silicon dioxide in an ethanol water solution, adding a modifier, and reacting for 2-4 hours at 60-80 ℃ to obtain silanized silicon dioxide; (3) Dispersing silanized silicon dioxide in toluene, adding oleamide and azodiisobutyronitrile in nitrogen atmosphere, and reacting for 3-5 hours at 60-80 ℃ to obtain modified silicon dioxide; the preparation method of the modified polytetrafluoroethylene fiber comprises the following steps: fully soaking polytetrafluoroethylene fibers into a reaction solution consisting of glycidyl methacrylate and methanol, introducing nitrogen to remove oxygen, sealing, and adopting 60 Co source gamma-ray irradiation reaction to obtain the modified polytetrafluoroethylene fibers.
  2. 2. The method for preparing the spunlaced filter material for the filter cartridge of claim 1, wherein the mass ratio of polytetrafluoroethylene fibers to glycidyl methacrylate is 100:10-20.
  3. 3. The method for preparing the spunlaced filter material for the filter cartridge of claim 1, wherein the irradiation reaction temperature is 25-30 ℃ and the irradiation dose is 30-40 kGy.
  4. 4. The method for preparing a spunlaced filter material for filter cartridges of claim 1, wherein in the step (1), the molar ratio of 1-methylbenzotriazole-5-carboxylic acid, 3- (N-allylamino) propyltrimethoxysilane and N, N' -dicyclohexylcarbodiimide is 1:1.0-1.2:1.0-1.1.
  5. 5. The method for preparing the spunlaced filter material for the filter cartridge of claim 1, wherein the mass ratio of the silicon dioxide to the modifier in the step (2) is 100:5-15.
  6. 6. The method for preparing the spunlaced filter material for filter cartridges of claim 1, wherein the mass ratio of silanized silica, oleamide and azodiisobutyronitrile in the step (3) is 100:20-40:0.2-0.4.
  7. 7. The spun-laced filter material for filter cartridges obtained by the preparation method of any one of claims 1-6.

Description

Water-jet filter material for filter cartridge and preparation method thereof Technical Field The invention relates to the technical field of industrial filter materials, in particular to a water-jet filter material for a filter cartridge and a preparation method thereof. Background The filter material of the filter cartridge is used as an important component of a filter material for industrial dust removal, and is widely applied to flue gas purification and dust collection systems in industries such as steel, cement, chemical industry, electric power and the like. The filter material of the filter cartridge has the advantages of large filtering area, low resistance, good ash removing effect and the like, and is a core filtering element of the bag type dust collector and the filter cartridge dust collector. Along with the increasingly strict national environmental protection standards and the complicating industrial production conditions, higher requirements are put forward on the filtering precision, the service life, the temperature resistance and the chemical stability of the filter material of the filter cartridge, and particularly under the severe working conditions of high temperature, strong acid and alkali, organic solvents and the like, the filter material needs to have excellent filtering efficiency and long-term stability. The prior patent CN202310238590.0 discloses a production method of a high-strength corrosion-resistant industrial filter material, which aims to provide a production method of an industrial filter material with high comprehensive performance, high structural strength, high strength and strong corrosion resistance to a coating, and the technical scheme is characterized in that polyester fiber or polytetrafluoroethylene fiber or the mixture of the polyester fiber and the polytetrafluoroethylene fiber is adopted, the polyester fiber and the polytetrafluoroethylene fiber are light in weight, the base cloth layer of the filter material forms a strong high-temperature resistant effect when the base cloth layer is used on the filter material, and the fiber felt is immersed in an immersion tank filled with polytetrafluoroethylene emulsion before the base cloth layer is prepared, so that the corrosion resistance of the fiber felt is greatly improved, and then the formed base cloth layer has the best high-temperature resistant and corrosion resistant effects. However, the prior art has the following defects that firstly, polytetrafluoroethylene emulsion impregnation treatment is only physical coating, effective chemical bonding is lacking between polytetrafluoroethylene and a fiber substrate, coating falling and performance attenuation easily occur in the long-term use process, and secondly, the surface wettability, antistatic property and antibacterial property of a filter material are difficult to improve simultaneously by simple polytetrafluoroethylene impregnation, and the comprehensive functionalization effect is limited. Disclosure of Invention In view of the above, the invention provides a water-jet filter material for a filter cartridge and a preparation method thereof, and aims to solve the problems that the existing filter material lacks effective chemical bonding to cause coating falling and single-function modification is difficult to realize the synergistic optimization of multiple performances such as filtering performance, corrosion resistance and the like. The technical scheme of the invention is realized in such a way that the invention provides a preparation method of a water-jet filter material for a filter cartridge, which comprises the following steps: S1, respectively opening and mixing the modified polytetrafluoroethylene fibers and the polyester fibers to obtain mixed fibers, wherein the mass ratio of the modified polytetrafluoroethylene fibers to the polyester fibers is 1:1, and carding, lapping, grid connection and pre-needling the mixed fibers to obtain a pre-needled felt; s2, carrying out water jet reinforcement and drying shaping on the pre-needled felt to obtain a filter material plain felt; s3, after singeing treatment is carried out on the surface of the filter material plain felt, immersing the filter material plain felt in finishing liquid, and carrying out liquid rolling and drying on the immersed filter material plain felt to obtain the spunlaced filter material for the filter cartridge. Specifically, the modified polytetrafluoroethylene fibers and the polyester fibers are mixed, so that excellent chemical corrosion resistance and high temperature resistance of polytetrafluoroethylene are ensured, good mechanical strength and forming processability of the polyester fibers are fully utilized, a fiber felt structure formed by carding, lapping, grid connection and pre-needling processes is uniform and stable, good mechanical combination is formed among the fibers through water needling reinforcement treatment, tensile strength and dimensional stability of