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A braided tube homogeneously-enhanced type polyvinylidene fluoride hollow fiber film and a preparing method thereof

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of polymer hollow fiber membrane preparation, and can solve the problem of easy peeling off of the cortex and poor bonding force between the braided tube reinforced hollow fiber membrane polyvinylidene fluoride resin and the braided tube and other issues, to achieve the effect of reducing membrane production cost, low cost and low energy consumption

Active Publication Date: 2015-09-09
安徽指南针科创园发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the separation layer polyvinylidene fluoride resin of the braided tube-reinforced hollow fiber membrane is not well bonded to the braided tube, and the cortex is easy to fall off, the present invention proposes a solution for heat-treating the two-dimensional braided tube with a low-concentration PVDF solution. Provide a method for preparing braided pipe homogeneously reinforced polyvinylidene fluoride hollow fiber membrane with low production cost and excellent performance

Method used

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  • A braided tube homogeneously-enhanced type polyvinylidene fluoride hollow fiber film and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (1) Configuration of braided tube soaking solution A: by mass percentage, first weigh 6% polyvinylidene fluoride resin and place it in a jar, then add 88% solvent and 6% hydrophilic agent to it, and stir to accelerate Dissolution of polyvinylidene fluoride and hydrophilic agent, and finally let it stand for defoaming.

[0078] In this process step, the braided tube is braided by polyester fiber and polyamide fiber, the inner diameter of the braided tube is 0.7mm, and the outer diameter is 1.9mm; the polyvinylidene fluoride PVDF resin is Solef 6010, purchased from Shanghai Solvay Co., Ltd.; The solvent is N,N-dimethylacetamide (DMAC); the hydrophilic agent is a mixture of glycerol and polyethylene glycol 400 at a ratio of 2:1.

[0079] (2) The configuration of coating casting solution B on the outside of the braided tube: in terms of mass percentage, first weigh 15% polyvinylidene fluoride resin and place it in a jar, then add 8% polymer to the jar to form holes agent, ...

Embodiment 2

[0086] (1) Configuration of braided tube soaking solution A: First weigh 2% polyvinylidene fluoride resin and place it in a jar, then add 88% solvent and 10% hydrophilic agent to it, and stir to accelerate Dissolution of polyvinylidene fluoride and hydrophilic agent, and finally let it stand for defoaming.

[0087] In this process step, the braided tube is braided by polyester fiber and polyamide fiber, the inner diameter of the braided tube is 0.7mm, and the outer diameter is 1.0mm; the polyvinylidene fluoride PVDF resin is 6010, purchased from Shanghai Solvay Co., Ltd.; the solvent It is N,N-dimethylformamide (DMF); the hydrophilic agent is made by mixing isopropanol and n-butanol at a ratio of 3:1.

[0088] (2) The configuration of coating casting solution B on the outside of the braided tube: in terms of mass percentage, first weigh 14% polyvinylidene fluoride resin and place it in a jar, then add 7% polymer to the jar to form holes agent, 75% solvent and 4% hydrophilic a...

Embodiment 3

[0094] (1) Configuration of braided tube soaking solution A: by mass percentage, first weigh 10% polyvinylidene fluoride resin and place it in a jar, then add 87% solvent and 3% hydrophilic agent to it, and stir to accelerate Dissolution of polyvinylidene fluoride and hydrophilic agent, and finally let it stand for defoaming.

[0095] In this process step, the braided tube is braided by polyester fiber and polyamide fiber, the inner diameter of the braided tube is 0.7mm, and the outer diameter is 1.5mm; the polyvinylidene fluoride PVDF resin is 6010, purchased from Shanghai Solvay Co., Ltd.; the solvent It is N,N-dimethylacetamide (DMAC); the hydrophilic agent is made by mixing ethanol and ethylene glycol at a ratio of 2:1.

[0096] (2) The configuration of coating casting solution B on the outside of the braided tube: in terms of mass percentage, first weigh 18% polyvinylidene fluoride resin and place it in a jar, then add 10% polymer to the jar to form holes agent, 64% solv...

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Abstract

The invention discloses a preparing method of a braided tube homogeneously-enhanced type polyvinylidene fluoride hollow fiber film, and belongs to the field of polymer film product preparation. The preparing method includes firstly preparing a polyvinylidene fluoride solution A having a certain low concentration, dipping a braided tube with the solution A to allow the polyvinylidene fluoride solution to penetrate into the inside of the braided tube, coating the outside of the braided tube with a high-concentration polyvinylidene fluoride film casting solution B having a certain formula, and putting the braided tube coated with the solution A and the solution B into a coagulating bath to allow the polyvinylidene fluoride coated in the two times to be subjected to phase separation simultaneously. The polyvinylidene fluoride hollow fiber film prepared by the method is advantageous in that 1) the inner low-concentration polyvinylidene fluoride solution tightly surrounds fibers of the braided tube, is tightly connected to an outer film layer after phase transition, and is not liable to shed; 2) a high-aperture-ratio compact surface layer is formed from the outer high-concentration film casting solution and provides effects of filtration; and 3) the braided tube with high strength provides excellent film fiber longitudinal stretching strength.

Description

technical field [0001] The invention belongs to the field of polymer hollow fiber membrane preparation, and relates to a preparation method of a homogeneously reinforced polyvinylidene fluoride hollow fiber membrane using braided tubes. Background technique [0002] As the application range of polyvinylidene fluoride hollow fiber membranes becomes wider and wider, the requirements for its performance are getting higher and higher. Traditional single substance hollow fiber membrane materials (such as solution spinning membranes with poor mechanical properties, etc.) It cannot fully adapt to the development needs of the application of membrane separation technology. Heterogeneous reinforced polyvinylidene fluoride hollow fiber membrane (using polyester, polyamide fiber and other hollow tubular braids or woven fabrics as reinforcements, coating polyvinylidene fluoride casting liquid on the surface, forming surface separation after composite curing layer, the surface separation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 田立林黑牯胡庆春李亮
Owner 安徽指南针科创园发展有限公司
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