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Preparation method of braided tube enhanced hollow fiber membrane

A braided tube and reinforced technology, which is applied in the field of water treatment membrane preparation, can solve the problems of increased coating depth and decreased flux of membrane filaments, and achieve the effects of loosening and improving permeability.

Inactive Publication Date: 2018-04-20
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although deep coating can be achieved by the above means, there is always a contradiction between the increase of coating depth and the decrease of membrane flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take a roll of polyester fiber braided tube (hereinafter referred to as braided tube), immerse it in the calcium carbonate aqueous slurry prepared in advance (the mass fraction of calcium carbonate is 10%, and the particle size of calcium carbonate is 40nm), soak the braided tube for 1 hour Take it out from the slurry, put it in an oven, heat it to 25°C and dry it for 0.5h, take it out and place it on the winding wheel, use the existing braided tube film preparation technology to extrude the braided tube through the spinneret and roll it on the braided tube The outer surface is coated with a layer of functional layer film-forming material solution, and then the braided tube coated and infiltrated with the film-forming material solution is drawn into a coagulation bath filled with 2000ppm hydrochloric acid and cured in the coagulation bath for 10 seconds to obtain a braided tube enhanced type Hollow fiber membrane.

[0011] The mechanical properties of the obtained braid...

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PUM

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Abstract

The invention discloses a preparation method of a braided tube enhanced hollow fiber membrane. The preparation method comprises the following steps: firstly, soaking a hollow braided tube in aqueous slurry of calcium carbonate, wherein calcium carbonate nanoparticles are doped into the fiber structures of the hollow braided tube, the calcium carbonate aqueous slurry is obtained by mixing and stirring hydrophilic nano calcium carbonate and water, and nano calcium carbonate accounts for 5-20% by mass of the suspension; then, drying the mixture for 0.5-6h at 20-50 DEG C, extruding the hollow braided tube through a spinneret plate by means of a hollow braided tube preparation technology and coating a functional layer membrane forming slurry to the outer surface of the braided tube; and finally, feeding the hollow braided tube soaked in the membrane forming slurry into an aqueous phase coagulating bath containing 10-30 DEG C acid to be coagulated for 5-20s to obtain the braided tube enhanced hollow fiber membrane. A sponge layer free of separating effect is smoothened, so that the transparent performance of the obtained membrane is further improved.

Description

technical field [0001] The invention relates to the technical field of water treatment membrane preparation, in particular to a method for preparing a braided tube reinforced hollow fiber membrane. Background technique [0002] With the continuous improvement of the service life requirements of the hollow fiber membrane in the water treatment industry, the development of various braided tube-reinforced hollow fiber membranes has attracted widespread attention in the industry. Usually, the preparation method of braided tube-reinforced hollow fiber membrane is to directly coat the outer surface of the hollow braided tube with the matrix phase film-forming system of the solution spinning method, and then enter a coagulation bath such as water to solidify and form pores, and then obtain a braided tube-reinforced hollow fiber membrane. Fiber membrane. In order to ensure that the braided tube-reinforced hollow fiber membrane does not peel during use (that is, the separation betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/02B01D67/00
CPCB01D69/08B01D67/00B01D69/02B01D69/085B01D2325/026B01D2325/24
Inventor 胡晓宇梁义高旭孙道宝
Owner TIANJIN MOTIMO MEMBRANE TECH
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