Preparation method of enhanced hollow polyvinylidene fluoride fiber membrane

A polyvinylidene fluoride and enhanced technology, which is applied in the field of preparation of enhanced polyvinylidene fluoride hollow fiber membranes, can solve problems affecting the quality of effluent water, affecting the service life of the membrane, and damage to the surface separation layer, and achieves a good interface bonding state , Increase the effect of mechanical bonding strength and high interface bonding strength

Active Publication Date: 2013-12-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of coating method simply coats the casting liquid on the surface of the fiber braided tube, because the fiber braided tube and the polymer separation membrane are two materials with different interface properties, and the bonding ability between the two materials is limited (such as Polyvinylidene fluoride separation membrane and polyester fiber braided tube), when the hollow fiber membrane is used in a high-strength vibration environment or frequently backwashed, peeling between the polyvinylidene fluoride coating layer and the polyester fiber braided tube is prone to occur , causing structural damage to the surface of the membrane and affecting the quality of the effluent
[0009] The problems in the abo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Preparation of reinforcement: Polyacrylonitrile fibers were woven into hollow braided tubes using two-dimensional weaving technology, and used as reinforcements for reinforced polyvinylidene fluoride hollow fiber membranes, with a breaking strength of 93.2 MPa.

[0023] 2) Prepare the separation layer casting solution: polyvinylidene fluoride resin accounting for 14wt.% of the total mass of the system, N,N-dimethylacetamide accounting for 78wt.% of the total system mass, and polyethylene accounting for 6wt.% of the total system mass Pyrrolidone (molecular weight: 30,000) was blended with Tween-80 accounting for 2wt.% of the total mass of the system, stirred in a water bath at 70°C for 4 hours to dissolve evenly, and vacuum defoamed to obtain a uniform polyvinylidene fluoride casting solution.

[0024] 3) Reinforcement surface pretreatment: wash the reinforcement prepared in step 1) with a neutral detergent, dry it, and soak it with ethanol for 5 seconds.

[0025] 4) ...

Embodiment 2

[0028] 1) Preparation of reinforcement: Polyacrylonitrile fibers were woven into hollow braided tubes using two-dimensional weaving technology, and used as reinforcements for reinforced polyvinylidene fluoride hollow fiber membranes, with a breaking strength of 93.2 MPa.

[0029] 2) Prepare the separation layer casting solution: polyvinylidene fluoride resin accounting for 10wt.% of the total mass of the system, N,N-dimethylformamide accounting for 79wt.% of the total system mass, and 10wt.% of the total system mass Polyvinylpyrrolidone (molecular weight: 30,000) is blended with Tween-80 accounting for 1wt.% of the total mass of the system, stirred in a water bath at 75°C for 4 hours to dissolve evenly, and vacuum defoamed to obtain a uniform polyvinylidene fluoride cast film liquid.

[0030] 3) Reinforcement surface pretreatment: wash the reinforcement prepared in step 1) with a neutral detergent, dry it, and soak it with ethanol for 60 seconds.

[0031] 4) Preparation of re...

Embodiment 3

[0034] 1) Preparation of reinforcement: Polyacrylonitrile fibers were woven into hollow braided tubes using two-dimensional weaving technology, and used as reinforcements for reinforced polyvinylidene fluoride hollow fiber membranes, with a breaking strength of 93.2 MPa.

[0035]2) Preparation of separation layer casting solution: Polyvinylidene fluoride resin accounting for 12wt.% of the total mass of the system, N,N-dimethylacetamide accounting for 80wt.% of the total mass of the system, accounting for 6wt.% of the total system mass Polyethylene glycol-600 and Tween-80 accounting for 2wt.% of the total mass of the system are blended, stirred for 4 hours in a 70°C water bath environment, dissolved evenly, and then vacuum defoamed to obtain a uniform polyvinylidene fluoride casting solution .

[0036] 3) Reinforcement surface pretreatment: wash the reinforcement prepared in step 1) with a neutral detergent, dry it, and soak it with isopropanol for 30 seconds.

[0037] 4) Prep...

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Abstract

The invention discloses a preparation method of an enhanced hollow polyvinylidene fluoride fiber membrane. The preparation method comprises the following steps: (1) preparation of an enhanceosome: braiding polyacrylonitrile fiber into a hollow braided pipe by adopting a two-dimensional braiding technology; (2) preparation of separation layer casting film liquor: respectively dissolving 5-25wt% polyvinylidene fluoride resin and 5-30wt% of additive into a solvent, stirring and dissolving under the condition of 70-90 DEG C, conducting vacuum defoaming to obtain the separation layer casting film liquor; (3) surface pretreatment of the enhanceosome: cleaning and drying the enhanceosome with a neutral detergent, and then infiltrating the enhanceosome with slight polar organic liquid; and (4) preparation of the enhanced hollow polyvinylidene fluoride fiber membrane: evenly coating the separation layer casting film liquor obtained from the step (2) on the surface of the enhanceosome treated in the step (3), and curing to obtain the enhanced hollow polyvinylidene fluoride fiber membrane. The binding strength of a separation layer on the surface of the enhanced hollow polyvinylidene fluoride fiber membrane prepared by adopting the method and the enhanceosome is high, and the separation layer and the enhanceosome are unlikely to strip, and high-pressure backflushing can be conducted.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for preparing a reinforced polyvinylidene fluoride hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride has strong anti-pollution, good anti-ultraviolet and weathering resistance, good mold resistance, high impact strength and abrasion resistance, good chemical stability (not easy to be corroded by acid, alkali, halogen or strong oxidant, etc. ) and other advantages, has been widely used in the field of film production. However, the strength of the polyvinylidene fluoride hollow fiber membrane prepared by the solution spinning method is low, and it is impacted by high-pressure water flow for a long time during use. Component life is reduced, productivity is reduced, and production costs are increased. [0003] At present, there are two methods for preparing reinforced polyvinylidene fluoride hollow fiber membranes: [0004] One is the prepara...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/08
Inventor 肖长发权全刘海亮黄庆林胡晓宇环国兰
Owner TIANJIN POLYTECHNIC UNIV
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