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CN-121714982-B - PPS superfine fiber composite filter material and preparation method thereof

CN121714982BCN 121714982 BCN121714982 BCN 121714982BCN-121714982-B

Abstract

The invention relates to the technical field of composite filter materials, in particular to a PPS ultrafine fiber composite filter material and a preparation method thereof, comprising the following steps of S1, putting PPS fibers and glass fibers into an opening mixer, uniformly mixing, carding, lapping and needling to be reinforced by adopting a multi-layer carding lapping machine to obtain two layers of composite fiber webs, S2, dipping the two layers of composite fiber webs into dipping modification liquid, extruding redundant emulsion, S3, sintering the dipped composite fiber webs at a high temperature for 3-5min, spreading PTFE microporous films on the surfaces of the high-temperature sintered composite fiber webs, hot-pressing for 30-60s, S4, hot-pressing and solidifying the hot-pressed composite fiber webs for 2-3min, and then, carrying out quick flame and calendaring for 3-8s to finally obtain the PPS ultrafine fiber composite filter material. According to the invention, the combination strength and durability between the membrane and the felt are obviously improved through the synergistic effect of the impregnation modifying liquid and the functional modifying liquid, interlayer peeling is prevented under the complex working conditions of high temperature and high humidity, and the compact network structure formed on the surface further improves the dirt resistance and the ash removal efficiency.

Inventors

  • SHAO HUI
  • PANG LINYONG
  • SHAO JUFEN
  • XU YINGWU
  • SUN MINFANG

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
20260213

Claims (8)

  1. The preparation method of the PPS superfine fiber composite filter material is characterized by comprising the following preparation steps: S1, putting 60-70 parts of PPS fibers and 25-30 parts of glass fibers into an opening mixer for 10-15min, uniformly mixing, carding, lapping and needling by using a multi-layer carding lapping machine to obtain a two-layer composite fiber web; S2, dipping the two-layer composite fiber web obtained in the step S1 in dipping modification liquid for 30-60S, controlling the penetration depth to be 100-200 mu m, extruding redundant emulsion after dipping, and controlling the liquid carrying rate to be 30-40%; S3, sintering the composite fiber net impregnated in the step S2 at a high temperature for 3-5min, spreading a PTFE microporous film on the surface of the composite fiber net sintered at a high temperature, and hot-pressing for 30-60S at a temperature of 280-300 ℃ under a pressure of 0.3-0.5 MPa; S4, carrying out hot pressing solidification on the composite fiber web subjected to hot pressing in the step S3 for 2-3min at a temperature of 260-280 ℃ under a pressure of 0.2-0.4MPa, quickly passing through flame, removing surface hairiness, and carrying out calendaring treatment for 3-8S to finally obtain the PPS ultrafine fiber composite filter material; The preparation of the impregnation modifying liquid comprises the following steps: S21, mixing 100-110 parts by mass of PTFE emulsion with 30-45 parts by mass of functional modification liquid, and stirring at a rotating speed of 150-200r/min for 10-15min to obtain primary modification liquid; s22, adding 1-3 parts of silane coupling agent KH-550 into the primary modified liquid obtained in the step S21, and continuously stirring at the rotating speed of 150-200r/min for 10-15min to obtain secondary modified liquid; S23, adding 5-10 parts of polytetrafluoroethylene micro powder and 3-5 parts of nano alumina into the secondary modified liquid obtained in the step S22, stirring for 20-30min at a rotating speed of 500-600r/min, and then regulating the solid content to 30-35% by using deionized water to obtain an impregnation modified liquid; the preparation of the functional modification liquid comprises the following steps: S211, mixing 20-30 parts by mass of polyimide resin solution with the mass concentration of 10% with 10-15 parts by mass of polyether-ether-ketone resin solution with the mass concentration of 5%, and stirring at the rotating speed of 200-300r/min for 10-15min to obtain a primary mixed solution; S212, adding 1-2 parts of polytetrafluoroethylene, 1-2 parts of acrylic ester, 0.5-1.5 parts of antioxidant 1010 and 1-2 parts of cross-linking agent into the primary mixed solution obtained in the step S211, and stirring at a rotating speed of 300-400r/min for 15-20min to obtain a secondary mixed solution; s213, regulating the solid content of the secondary mixed liquid obtained in the step S212 to 12-15% by using deionized water, and sieving with a 200-mesh sieve to finally obtain the functional modified liquid.
  2. 2. The method for preparing the PPS ultrafine fiber composite filter material according to claim 1, wherein the base fabric layer of the multi-layer carding lapping machine is 300-350g/m 2 , the filter felt layer is 150-200g/m 2 , and the lapping speed is 5-8m/min.
  3. 3. The method for preparing a PPS ultrafine fiber composite filter material according to claim 1, wherein the needling density of the needling reinforcement is 500-800 needling/cm 2 , and the needling depth is 8-12mm.
  4. 4. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, wherein the high-temperature sintering temperature in step S3 is 320-350 ℃.
  5. 5. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, wherein the pressure of the calender treatment in step S4 is 0.1 to 0.2MPa, and the temperature is 200 to 220 ℃.
  6. 6. The method for preparing a PPS ultrafine fiber composite filter material according to claim 1, wherein the solid content of the PTFE emulsion in step S21 is 60%.
  7. 7. The method for preparing a PPS ultrafine fiber composite filter material according to claim 1, wherein the cross-linking agent is selected from cross-linking agents XC-103.
  8. Pps ultrafine fibrous composite filter material, characterized in that it is produced by the production method according to any one of the preceding claims 1 to 7.

Description

PPS superfine fiber composite filter material and preparation method thereof Technical Field The invention relates to the technical field of composite filter materials, in particular to a PPS superfine fiber composite filter material and a preparation method thereof. Background Industrial flue gas treatment is a key link in the field of environmental protection, especially in the high pollution industries of waste incineration, chemical industry, cement, steel, electric power and the like, the flue gas components become more complex, and acid gas (such as SO 2、NOx), oil mist, water vapor, sticky dust and various organic pollutants are often contained at the same time. The coexisting working condition of multiple pollutants brings severe comprehensive performance requirements to the filter material, and the traditional single-material filter material is difficult to adapt. At present, high-temperature filter materials commonly used in the market mainly comprise pure PPS (polyphenylene sulfide) filter materials and pure PTFE (polytetrafluoroethylene) filter materials, and PTFE coated PPS composite filter materials developed on the basis of the pure PPS filter materials and the pure PTFE (polytetrafluoroethylene) filter materials. Although the pure PPS filter material has good acid resistance and temperature resistance, the pure PPS filter material has poor oxidation resistance, is easy to oxidize and embrittle under the working condition of high oxygen content or oil mist, leads to the decrease of fiber strength and the breakage of a filter bag, and has the phenomenon of 'sticking a bag', so that the running resistance is suddenly increased, the ash removal is difficult, and the service life is seriously influenced. The pure PTFE filter material has excellent chemical stability, corrosion resistance and adhesion resistance, but has high cost, lower mechanical strength and poor processing performance, and is difficult to bear high-load mechanical scouring and system pressure difference when being used alone, thereby limiting the large-scale industrial application. In order to achieve both performance and cost, a PTFE coated PPS composite filter material is produced. The product attempts to combine the mechanical strength of PPS and the surface filtering property of PTFE by compounding a layer of PTFE microporous film on the surface of PPS base cloth. However, the existing film laminating process mostly adopts a direct hot-pressing laminating mode, the PTFE film and the PPS base cloth are mainly laminated by physical lamination, and the interfacial bonding force is weak. Under the actual working conditions of high temperature, high humidity, frequent temperature fluctuation or severe chemical corrosion, the membrane layer is easy to peel off, crack or microporous blockage with the base cloth, so that the surface filtering function is invalid, the filtering precision is reduced, and the service life is far less than expected. In addition, the traditional composite filter material has single structure function, can not realize functional partition and self-adaptive adjustment aiming at different pollutant combinations, and has insufficient adaptability in complex and changeable smoke environments. Along with the improvement of environmental protection requirements, industrial users put higher requirements on the service life, stability and running cost of the filter material. Therefore, developing a high-performance composite filter material which has firm interface combination, reasonable functional partition, excellent temperature resistance, corrosion resistance, adhesion resistance, high strength and adaptation to the working condition of complex pollutants has become a technical problem to be solved in the field. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a PPS superfine fiber composite filter material and a preparation method thereof. In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the PPS superfine fiber composite filter material comprises the following preparation steps: S1, putting 60-70 parts of PPS fibers (fineness is 2-3dtex, length is 51-64 mm) and 25-30 parts of glass fibers (alkali-free glass fibers, diameter is 5-9 mu m) into an opening mixer for 10-15min, uniformly mixing, carding and lapping by using a multi-layer carding lapping machine, and needling for reinforcement to obtain two layers of composite fiber webs; S2, dipping the two-layer composite fiber web obtained in the step S1 in dipping modification liquid for 30-60S, controlling the penetration depth to be 100-200 mu m, extruding redundant emulsion after dipping, and controlling the liquid carrying rate to be 30-40%; S3, sintering the composite fiber net impregnated in the step S2 at a high temperature for 3-5min, spreading a PTFE microporous film (with the thickness of 10-30 mu m and the aperture of 0.5-2