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Micron fiber/nanofiber composite filter material and preparation method thereof

A technology of microfibers and nanofibers, which is applied in the fields of filtration separation, fiber treatment, separation methods, etc., can solve the problems of complex production process, reduction of filtration resistance, non-reporting, etc., and achieve simple preparation method, strong process controllability, Effect of low resistance pressure drop

Active Publication Date: 2017-11-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing published patents for the preparation of composite filter materials include: "A Method for Preparation of Cellulose Nano-Carbon Fiber Filter Material" (CN201410007987.X), in which cellulose and lignin are mixed for electrospinning and carbonization to prepare carbon nano-fibers, the production process Complex, not conducive to large-scale production, and the toughness and strength of the prepared carbon nanofibers have not been clearly characterized; "a composite fiber filter material and its preparation method" (CN201610760620.4), including inorganic fibers and organic fibers The inorganic fiber is made of alkali-free glass fiber, quartz fiber or ceramic fiber, and the organic fiber is one of modified acrylic fiber, acrylic fiber or polyimide fiber. The fiber diameter is relatively thick and brittle. Large, filtration performance such as filtration efficiency and resistance pressure drop are not mentioned; the diameter involved in the patent "A high-efficiency and low-resistance electrospun nanofiber air filter material and batch preparation method" (CN201610784058.9) is 500-800nm The microspheres are embedded between the nanofibers to form a three-dimensional cavity structure, which reduces the filtration resistance. When the polymer low-concentration solution forms microspheres, it will form ultrafine nanofibers with a diameter of about 80nm, but the ultrafine nanofibers The coverage rate is not mentioned, and the improvement rate of filtration efficiency is not clear

Method used

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  • Micron fiber/nanofiber composite filter material and preparation method thereof
  • Micron fiber/nanofiber composite filter material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A microfiber / nanofiber composite filter material and a preparation method thereof, the preparation method mainly comprising the following steps:

[0031]1) Add polyvinylidene fluoride (weight-average molecular weight: 320,000) into N,N-dimethylformamide, seal it and place it in a water bath at 60°C for 10 hours with heating and stirring, and finally prepare a stable and uniform quality Concentration is the polymer spinning liquid A of 20wt%, is used for preparing nanofiber layer;

[0032] Similarly, polystyrene (with a weight average molecular weight of 80,000) was added to N, N-dimethylformamide, and after sealing, it was continuously stirred for 8 hours with a magnetic stirring device, and finally a stable and uniform concentration of 28% was prepared. The polymer spinning liquid B of is used for preparing micron fiber layer;

[0033] 2) The prepared polymer spinning solution A and the polymer spinning solution B are sucked into the spinning module through the liquid...

Embodiment 2

[0038] A microfiber / nanofiber composite filter material and a preparation method thereof, the preparation method mainly comprising the following steps:

[0039] 1) Add polyvinylidene fluoride (weight-average molecular weight: 570,000) into N,N-dimethylacetamide, seal it and place it in a water bath at 60°C for 8 hours with heating and stirring, and finally prepare a stable and uniform quality Concentration is the polymer spinning liquid A of 18wt%, is used for preparing nanofiber layer;

[0040] Similarly, polystyrene (with a weight average molecular weight of 80,000) was added to N, N-dimethylformamide, and after sealing, it was continuously stirred for 8 hours with a magnetic stirring device, and finally a stable and uniform concentration of 28% was prepared. The polymer spinning liquid B of is used for preparing micron fiber layer;

[0041] 2) The prepared polymer spinning solution A and the polymer spinning solution B are sucked into the spinning module through the liquid...

Embodiment 3

[0046] A microfiber / nanofiber composite filter material and a preparation method thereof, the preparation method mainly comprising the following steps:

[0047] 1) Add polyvinylidene fluoride (weight-average molecular weight: 570,000) into N,N-dimethylacetamide, seal it and place it in a water bath at 60°C for 8 hours with heating and stirring, and finally prepare a stable and uniform quality Concentration is the polymer spinning liquid A of 18wt%, is used for preparing nanofiber layer;

[0048] Similarly, polysulfone (with a weight-average molecular weight of 70,000) was added to N, N-dimethylacetamide, and after sealing, it was continuously stirred for 15 hours with a magnetic stirring device, and finally a stable and uniform concentration of 29% was prepared. Polymer spinning solution B is used to prepare micron fiber layer;

[0049] 2) The prepared polymer spinning solution A and the polymer spinning solution B are sucked into the spinning module through the liquid supply...

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Abstract

The invention relates to a micron fiber / nanofiber composite filter material and a preparation method thereof. The preparation method includes: in an electrostatic spinning process, an annular gradient solvent vapor quick removing device is adopted for one-step forming on a receiving substrate to obtain the micron fiber and nanofiber integrated three-dimensional structural composite filter material according to a double-region isolation spinning control technique. Efficiency of the micron fiber / nanofiber composite filter material in filtering of 0.02-10micron particles reaches 99.95% or above, and resistance pressure drop is smaller than 40Pa. The preparation method is simple in process, controllability in fiber diameter and pore diameter is achieved, the obtained composite filter material is of micron / nano scale in fiber diameter and pore diameter, a great filtration performance is achieved, and the composite filter material is widely applicable to air purifying products such as mask filter elements, air purifiers and air conditioners.

Description

technical field [0001] The invention relates to a microfiber / nanofiber composite filter material and a preparation method thereof, in particular, through an annular gradient solvent vapor rapid removal device, a double-region isolation spinning control technology is used to form a one-step forming on a receiving substrate to obtain both microfiber and nanofiber The invention relates to a three-dimensional structure composite filter material of nanofibers, which belongs to the field of functional materials. Background technique [0002] The overall deterioration of our country's environment has not been fundamentally curbed, and the problem of environmental pollution has become one of the main factors threatening human health, public safety and social stability. Therefore, a high-efficiency air filter material is urgently needed. Nanomaterials have the functions of small size and diameter, large specific surface area, strong adsorption capacity, etc., and have a good filterin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01F1/10D01F6/12D01F6/14D01F6/16D01F6/18D01F6/22D01F6/50D01F6/60D01F6/62D01F6/76B01D39/00
CPCB01D39/00D01D5/0015D01D5/0061D01D5/0084D01F1/10D01F6/12D01F6/14D01F6/16D01F6/18D01F6/22D01F6/50D01F6/60D01F6/62D01F6/76
Inventor 丁彬廖亚龙赵兴雷李玉瑶印霞俞建勇
Owner DONGHUA UNIV
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