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CN-121754960-B - Wear-resistant blending gradient needling filter material and preparation method thereof

CN121754960BCN 121754960 BCN121754960 BCN 121754960BCN-121754960-B

Abstract

The invention relates to the technical field of preparation of filter materials, in particular to a wear-resistant blending gradient needled filter material and a preparation method thereof, comprising the following steps of S1, preparing a first mixture and a second mixture, respectively lapping the first mixture and the second mixture to obtain an inner layer and an outer layer, S3, hooking and cohesion the outer layer and the inner layer together through pre-needling to obtain a base material, S4, vacuum impregnating the base material in the step S3 in impregnating liquid for h, S5, treating the base material in the step S4 at 80-120 ℃ for 15-30min, S6, applying a finishing agent to the surface of the base material treated in the step S5 in a padding mode, S7, treating the base material treated in the step S6 at 150-200 ℃ for 3-5min, S8, and paving a PTFE microporous membrane on the base material treated in the step S7. The filter material prepared by the invention has high transverse breaking strength and longitudinal breaking strength and excellent filter efficiency.

Inventors

  • PANG XUN
  • PANG TINGTING
  • Wang Xiaqiang
  • WU YOULIN
  • WANG JIANHUA

Assignees

  • 台州市皓天产业用布股份有限公司
  • 浙江皓天环保科技有限公司

Dates

Publication Date
20260508
Application Date
20260303

Claims (9)

  1. 1. The preparation method of the wear-resistant blending gradient needled filter material is characterized by comprising the following steps of: S1, respectively opening and mixing the heavy denier polyester fibers and the conductive fibers to obtain a first mixture, respectively opening and mixing the fine denier polyester fibers and the conductive fibers to obtain a second mixture; s2, carding and lapping the first mixture obtained in the step S1, forming an outer layer in an air-laid mode, carding and lapping the second mixture obtained in the step S1, and forming an inner layer in an air-laid mode; S3, hooking and cohesion of the outer layer and the inner layer obtained in the step S2 together through pre-needling in a mechanical net forming mode to obtain a base material; S4, vacuum dipping the base material in the step S3 in dipping liquid for 1-2h; S5, treating the base material treated in the step S4 at 80-120 ℃ for 15-30min; S6, applying finishing agent to the substrate treated in the step S5 in a padding mode; s7, treating the base material treated in the step S6 at 150-200 ℃ for 3-5min; S8, singeing and calendaring the base material treated in the step S7, and finally compounding a PTFE microporous membrane on the surface of the base material to obtain a filter material; the impregnating solution in the step S3 comprises modified nano silicon dioxide, modified nano montmorillonite, epoxy resin emulsion, a curing agent and gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane; The modified nano silicon dioxide is carbon-coated nano silicon dioxide; The modified nano montmorillonite is obtained by processing nano montmorillonite by cetyl trimethyl ammonium bromide solution.
  2. 2. The method for preparing the wear-resistant blended gradient needled filter material according to claim 1, wherein the mass ratio of the heavy denier polyester fiber to the conductive fiber in the step S1 is 7:3, and the mass ratio of the fine denier polyester fiber to the conductive fiber is 7:3.
  3. 3. The method for preparing the wear-resistant blended gradient needled filter material according to claim 2, wherein the fineness of the heavy denier polyester fiber in the step S1 is 4-6dtex, and the fineness of the fine denier polyester fiber is 0.5-1dtex.
  4. 4. The method for preparing the wear-resistant blended gradient needled filter material according to claim 2, wherein the conductive fibers in the step S1 are carbon black coated polyester fibers, and the fineness of the conductive fibers is 1-1.5dtex.
  5. 5. The preparation method of the wear-resistant blended gradient needled filter material according to claim 1 is characterized in that the preparation method of the carbon-coated nano silicon dioxide comprises the steps of coating the nano silicon dioxide with polydopamine and calcining the coated nano silicon dioxide under inert gas.
  6. 6. The preparation method of the wear-resistant blended gradient needled filter material according to claim 1, wherein the specific step of treating the nano montmorillonite with a cetyltrimethylammonium bromide solution is that the nano montmorillonite is dispersed into a cetyltrimethylammonium bromide solution with the weight percent of 0.5-1.5%, then hydrochloric acid with the weight percent of 0.1mol/L is added dropwise, the pH is regulated to 5-6, the reaction is carried out for 1-2h at 65-80 ℃, and finally the reaction is dried for 8-12h at 50-60 ℃ after the reaction is washed by enough deionized water.
  7. 7. The method for preparing the wear-resistant blended gradient needled filter material according to claim 1, wherein the concentration of the epoxy resin emulsion is 8-12wt% and the curing agent is polyamide.
  8. 8. The preparation method of the wear-resistant blended gradient needled filter material according to claim 1, wherein the mass ratio of modified nano silicon dioxide to modified nano montmorillonite to epoxy resin emulsion to curing agent to gamma- (2, 3-glycidoxy) propyl trimethoxy silane is 1 (0.5-2), 80-120, 2-3 and 0.2-0.5.
  9. 9. An abrasion-resistant blended gradient needled filter material, which is characterized by being prepared by the preparation method of the abrasion-resistant blended gradient needled filter material as claimed in any one of claims 1 to 8.

Description

Wear-resistant blending gradient needling filter material and preparation method thereof Technical Field The invention relates to the technical field of preparation of filter materials, in particular to an abrasion-resistant blending gradient needled filter material and a preparation method thereof. Background In the field of high-abrasion industrial dust treatment of iron and steel, ore crushing, casting and the like, the filter material of the bag type dust collector faces serious service life challenges. The dust characteristics of the industries are extremely special, namely, the concentration is high, the hardness of particles is high, the edges and corners are clear, and the filter materials are continuously eroded and worn. Although the cost of the mainstream common polyester filter materials in the current market is low, the wear resistance is seriously insufficient, and under the continuous impact of high-speed dust, the fibers are quickly ground to form holes, so that the discharge exceeds the standard and fails. This is especially common in the processes of ore crushing, steel sintering and the like, and the filter material needs to be replaced when the filter material is used for less than half a year, so that the stable operation of the dust removal system is seriously affected. In addition to the abrasion problem, high concentrations of dust can also generate a large amount of static charges during filtration due to intense friction, which accumulate to a certain extent with a significant safety risk of dust explosion. In recent years, dust explosion accidents caused by insufficient antistatic performance of filter materials occur, and huge losses are caused for enterprises. Although some wear-resistant or antistatic improved products exist in the market, the problem of unbalanced performance often exists, namely, the wear resistance is excessively emphasized and the filtering precision or the ash removing performance can be sacrificed, the manner of adding the conductive fibers is uneven or not durable, and the antistatic performance is rapidly attenuated along with the extension of the service time. The imbalance of the performance severely restricts the application effect of the filter material under the working condition of high abrasion. The existing products lack systematic optimization in structural design and material proportion, and are difficult to achieve good balance among various performances. Particularly, under some extreme working conditions, the wear resistance and the antistatic performance of the filter material often cannot meet the requirements at the same time, and hidden danger is brought to safe production. Many dust collecting equipment manufacturers reflect that the existing filter material products are difficult to meet the requirement of customers on long-period stable operation of equipment, and frequent filter material replacement not only increases maintenance cost, but also influences normal operation of main equipment. In addition, with the improvement of environmental protection requirements, dust emission standards are increasingly strict, and the damage and failure of filter materials directly lead to the emission exceeding standards, so that enterprises face environmental protection punishment risks. Therefore, development of a filter material capable of filtering high strength, durable antistatic property and high efficiency is an urgent need in the application field. The new material needs to carry out systematic innovation from multiple dimensions such as fiber proportioning, structural design, post-treatment process and the like, so that the service life and safety problems of the filter material under the high-abrasion working condition can be really solved. Disclosure of Invention The invention aims to provide an abrasion-resistant blending gradient needled filter material and a preparation method thereof, so as to solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: A preparation method of an abrasion-resistant blended gradient needled filter material comprises the following steps: S1, respectively opening and mixing the heavy denier polyester fibers and the conductive fibers to obtain a first mixture, respectively opening and mixing the fine denier polyester fibers and the conductive fibers to obtain a second mixture; S2, carding and lapping the first mixture obtained in the step S1, forming an outer layer in an air-laying mode, carding and lapping the second mixture obtained in the step S2, and forming an inner layer in the air-laying mode; S3, hooking and cohesion of the outer layer and the inner layer obtained in the step S2 together through pre-needling in a mechanical net forming mode to obtain a base material; S4, vacuum dipping the base material in the step S3 in dipping liquid for 1-2h; S5, treating the base material treated in the step S4 at