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Aramid fiber ultrafiltration membrane and preparation method thereof

A technology of ultrafiltration membrane and aramid fiber, which is applied in the field of preparation of aramid ultrafiltration membrane to achieve the effect of improving spinnability, membrane flux, and tensile and compressive strength

Inactive Publication Date: 2019-11-19
OCHEMATE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fatigue strength can be improved to a certain extent through the modification of aramid fiber, but the turbulent scouring and air scrubbing of the membrane during use will cause frequent shaking of the membrane filaments, and the membrane strength needs to be further improved to meet the requirements

Method used

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  • Aramid fiber ultrafiltration membrane and preparation method thereof
  • Aramid fiber ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take the aramid fiber solution (the solvent is DMAC, the same below), add calcium chloride, polyethylene glycol, and DMAc, stir at room temperature until completely dissolved, and vacuum defoam to form a homogeneous casting film solution. The polymer (aramid fiber) content in the casting solution is 15%, the calcium chloride content is 2%, and the polyethylene glycol content is 8% (mass percentage is the same below). Prepare a composite support fluid, which contains DMAc60%, ethanol 10%, and 30% deionized water. The casting liquid and three bundles of polyester reinforcing fibers are sprayed out together with the composite support liquid placed in the central tube of the nozzle through the cavity of the nozzle. ), rinsing and drying steps to obtain ultrafiltration membrane filaments. The immersion solution is 40% DMF, 8% ethanol, and the rest is deionized water. The secondary gel solution is 20% DMF, and the rest is deionized water. The inner diameter of the prepared...

Embodiment 2

[0024] Take the aramid fiber solution, add lithium chloride, polyethylene glycol, polyvinylpyrrolidone and DMAc, heat to 85°C and stir until completely dissolved, vacuum degassing to form a homogeneous casting film solution. The polymer content in the casting solution is 22%, the lithium chloride content is 5%, and the polyethylene glycol and polyvinylpyrrolidone content are 16%. Composite support liquid is prepared, which contains DMAc50%, 50% deionized water. The casting liquid and 5 bundles of nylon reinforcing fibers are sprayed out together with the composite support liquid placed in the central tube of the nozzle through the cavity of the nozzle. ), rinsing and drying steps to obtain ultrafiltration membrane filaments. The immersion liquid is DMF45%, ethylene glycol 5%, and the rest is deionized water. The secondary gel solution is 10% DMF, and the rest is deionized water. The inner diameter of the prepared ultrafiltration membrane filament is 0.7mm, the outer diamete...

Embodiment 3

[0026] Take the aramid fiber solution, add lithium chloride, polyethylene glycol, polyvinylpyrrolidone and DMAc, heat to 85°C and stir until completely dissolved, vacuum degassing to form a homogeneous casting film solution. The polymer content in the casting solution is 20%, the lithium chloride content is 5%, and the polyethylene glycol and polyvinylpyrrolidone content are 18%. Composite support liquid is prepared, which contains DMAc50%, 50% deionized water. The casting liquid and 5 bundles of nylon reinforcing fibers are sprayed out together with the composite support liquid placed in the central tube of the nozzle through the cavity of the nozzle. ), rinsing and drying steps to obtain ultrafiltration membrane filaments. The immersion liquid is DMF45%, glycerol 5%, and the rest is deionized water. The secondary gel solution is 10% DMF, and the rest is deionized water. The inner diameter of the prepared ultrafiltration membrane filament is 0.7mm, the outer diameter is 1....

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Abstract

The invention discloses a preparation method of an aramid fiber ultrafiltration membrane. The preparation method includes the following steps: at least one organic solvent, at least one additive and an aramid fiber solution are provided, after the organic solvent, the additives and the aramid fiber solution are mixed and dissolved, defoaming is carried out under a vacuum condition to prepare a membrane casting solution; the membrane casting solution and braided pipes or reinforcing fibers are sprayed through a nozzle, and an ejecta is immersed in immersion liquid and gel liquid in order to solidify the ejecta into membrane filaments; and the membrane filaments are rinsed, the additives and the solvent are removed, and then the aramid fiber ultrafiltration membrane is obtained. The invention also provides the aramid fiber ultrafiltration membrane prepared by the method. The aramid fiber ultrafiltration membrane of the invention can be effectively improved in the tensile and compressivestrength of the membrane, improved in the spinnability in the process of membrane preparation and greatly improved in membrane flux.

Description

technical field [0001] The invention relates to a method for preparing an aramid ultrafiltration membrane and an aramid ultrafiltration membrane prepared by the method. Background technique [0002] In my country, the aromatic polyamide fiber made from wholly aromatic polyamide polymer is called aramid fiber, and wholly aromatic polyamide generally refers to a long-chain polyamide in which more than 85% of the amide bonds are connected to two benzene rings. Among them, aramid 1313 is polym-phenylene isophthalamide, which has excellent high temperature resistance, flame retardancy and electrical insulation. Although expensive, it is irreplaceable and increasingly important in many application fields. Its main uses include: as a raw material for protective clothing, such as military, fire-fighting or civil heat-resistant protective clothing; as a filter material, such as high-temperature smoke filtration in areas with heavy air pollution such as steel, cement or carbon black;...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D69/08B01D71/56
CPCB01D61/145B01D67/0002B01D67/0079B01D69/08B01D71/56
Inventor 王冰菲方佩晖
Owner OCHEMATE MATERIAL TECH CO LTD
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