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High-adsorption nanofiber composite filter material and preparation method thereof

A nanofiber and composite filtration technology, which is applied in the field of textile materials, can solve the problems of low specific surface area and porosity, easy shedding of active particles, and difficult fiber diameter to reach the nanometer level, etc., to achieve excellent flexibility and plasticity, dense tissue structure, The effect of excellent filtration performance

Active Publication Date: 2014-09-03
武汉维晨科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantage of the above example is that the active particles and fibers are compounded in the subsequent steps, the dispersion uniformity of the active particles is not easy to control, and the active particles are easy to fall off during use, which affects the mechanical stability and use of the entire filter net. life
[0008] The disadvantage of the above example is that the fiber is prepared by ordinary melt spinning method, and the fiber diameter is difficult to reach the nanometer level. Compared with the nanofiber, its specific surface area and porosity are lower, thus affecting the filtration performance of the filter material
[0010] The disadvantage of the above examples is that the nanofiber material is inorganic carbon or activated alumina material, which has poor plasticity and toughness, and it is difficult to process the filter material into a web; at the same time, large-scale electrospinning equipment is expensive and costly, and it is difficult to carry out in the field of filtration. wide application

Method used

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Examples

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Effect test

preparation example Construction

[0044]A kind of preparation method of high adsorption nanofiber composite filter material, described preparation method is carried out according to the following steps:

[0045] a. Perform high-speed ball milling on the active particle material in a ball mill with a process temperature of 20-50° C. to prepare nano active particles with a diameter of 1-50 nm.

[0046] B with the nanometer active particle that obtains through step a and thermoplastic polymer by mass percent:

[0047] Thermoplastic polymer 70~99%

[0048] Nano active particles 1~30%

[0049] Perform uniform mixing and drying, extrude and granulate in a twin-screw extruder with a processing temperature of 130-270° C. to prepare nano active particle / thermoplastic polymer composite material.

[0050] c the nano active particles / thermoplastic polymer composite material obtained through step b and cellulose acetate butyrate in mass percent:

[0051] Nano active particle / thermoplastic polymer composite material 5~40...

Embodiment 1

[0059] 0.1Kg of activated carbon particles are milled at a high speed in a ball mill at a temperature of 30°C to obtain nano-sized activated carbon particles with an average diameter of 20nm, and then mixed with 1Kg of PVA-co-PE masterbatch and dried. Extrude and granulate in the extruder to prepare the nano activated carbon particles / PVA-co-PE composite material of 1.1Kg; then the composite material of 1.1Kg is mixed evenly with 4.4Kg cellulose acetate butyrate (CAB) , Extrude and granulate in a twin-screw extruder at a temperature of 170°C to prepare a 5.5Kg nano-activated carbon particle / PVA-co-PE / CAB composite material, and then melt the composite material through a melt spinning machine Spinning is carried out to obtain composite fibers; the composite fibers are refluxed in acetone at 60°C for 72 hours to extract cellulose acetate butyrate, and the composite fibers after extracting cellulose acetate butyrate are dried at room temperature to prepare PVA-co-PE as Continuous...

Embodiment 2

[0061] Perform high-speed ball milling of 0.2Kg silica particles in a ball mill at a temperature of 40°C to obtain nano-silica active particles with an average diameter of 30nm, and then mix them with 1KgPP masterbatch evenly and dry them in a twin-screw extruder at a temperature of 140°C. Extrude and granulate to prepare 1.2Kg of nano-silica active particles / PP composite material; then 1.2Kg of composite material and 9.6Kg cellulose acetate butyrate (CAB) are uniformly mixed, and the temperature is 140 ° C in a twin-screw Extrude and granulate in the extruder to prepare 10.8Kg of nano-silica active particles / PVA-co-PE / CAB composite material, and then spin this composite material through a melt spinning machine to obtain composite fibers; The fiber was refluxed in acetone at 60°C for 72 hours to extract cellulose acetate butyrate, and the composite fiber after extracting cellulose acetate butyrate was dried at room temperature to prepare a PP as the continuous phase and nano-si...

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Abstract

The invention relates to a high-adsorption nanofiber composite filter material which comprises a non-woven base material and a nanofiber membrane applied to the surface of the non-woven base material, wherein nanofibers forming the nanofiber membrane comprise continuous-phase thermoplastic polymers and disperse-phase active nanoparticles. A preparation process of the composite filter material comprises the steps of performing double-screw extruding and granulating on the active nanoparticles and the thermoplastic polymers according to a ratio to prepare a composite material; mixing the composite material with cellulose acetate butyrate according to a ratio, performing melt spinning, and performing solvent extraction to prepare thermoplastic nanofibers containing the active nanoparticles; finally, coating the surface of the non-woven base material with ethanol suspension of the thermoplastic nanofibers, and drying to obtain the high-adsorption nanofiber composite filter material. The preparation process is simple, the cost is low, the energy consumption is low, and the yield is high. The thermoplastic nanofibers containing the active nanoparticles are dense in tissue structure and controllable in diameter. The composite filter material has the characteristics of stable structural performance and excellent adsorption filtration performance.

Description

technical field [0001] The invention relates to a high-adsorption nanofiber composite filter material and a preparation method thereof, belonging to the technical field of textile materials. technical background [0002] Nanofiber is a kind of ultrafine fiber, which has the characteristics of large specific surface area, large aspect ratio and easy film formation. It is widely used in the fields of medicine, food, industry and household, especially as a filter material for air and water treatment. [0003] The nanofiber membrane material has a very small pore size and can intercept extremely fine particles in air and water. The existing method mainly improves the filtration efficiency of nanofiber membranes for particulate matter by changing the process conditions to reduce the fiber diameter and increase the membrane thickness. However, this method will reduce the output rate of clean water and clean air. Improving the adsorption performance of the fiber membrane itself ca...

Claims

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Application Information

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IPC IPC(8): B01D39/14B32B27/08
Inventor 王栋刘轲李沐芳刘琼珍马鹏飞肖钻
Owner 武汉维晨科技有限公司
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