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Polyamide hollow fiber nanofiltration membrane and preparation method

A technology of polyamide and nanofiltration membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems of poor interface stability and affect the performance of membrane products, and achieve high interface stability and compatibility Good, low product defect rate effect

Active Publication Date: 2019-08-16
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art hollow fiber nanofiltration membranes that are prone to form membrane defects due to poor interface stability and thus affect the performance of membrane products, and provide a polyamide hollow fiber nanofiltration membrane and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of polyamide hollow fiber nanofiltration membrane, 1) utilize non-solvent induced phase separation method to prepare hollow fiber base membrane, comprise the following steps, with membrane matrix phase 0.2kg polyvinylidene fluoride, 3kg dimethylacetamide Solvent, 0.1kg polyvinylpyrrolidone porogen and 0.1kg trimesoyl chloride polyacyl chloride are mixed evenly, and left to defoam; then heated to 50°C, flowed out through the spinneret to the coagulation tank and solidified into primary fibers; The inner core liquid of the spinneret is an aqueous solution at the same temperature as the spinning stock solution; the coagulation liquid in the coagulation tank is water; the coagulated primary fiber is wound, soaked in glycerin and dried to make a polyamide hollow fiber basement membrane;

[0022] 2) to prepare polyamide hollow fiber nanofiltration membrane, the surface of the polyamide hollow fiber base membrane obtained in step 1) is coated with ...

Embodiment 2

[0024] The preparation method of embodiment 2 is the same as that of embodiment 1, the only difference is that in step 1), 1 kg of polyether sulfone, 6 kg of dimethylacetamide solvent, 0.5 kg of polyvinylpyrrolidone porogen and 0.5 kg of phenylbenzene Triformyl chloride; in step 2), apply 1wt% trimesoyl chloride organic solution on the surface of the base film for 5 minutes, wipe off the surface floating liquid, apply 2wt% m-phenylenediamine aqueous solution on the surface of the base film for 1 minute, and then dry and solidify for 1 minute.

[0025] After testing, the membrane continuously filters 2g / L MgSO4 solution at 0.5MPa for 5 hours, and then tests the desalination rate of the component, and the desalination rate reaches 93.1%.

Embodiment 3

[0026] The preparation method of embodiment 3 is the same as that of embodiment 1, the only difference is that in step 1), 2 kg of polyvinylidene chloride, 6 kg of dimethylacetamide solvent, 1 kg of polyvinylpyrrolidone porogen and 1 kg of trimesin Acyl chloride; in step 2), apply 1wt% trimesoyl chloride organic solution on the surface of the base film for 5 minutes, wipe off the surface floating liquid, apply 2wt% m-phenylenediamine aqueous solution on the surface of the base film for 1 minute, and then dry and solidify for 1 minute.

[0027] After testing, the membrane continuously filters 2g / L MgSO4 solution at 0.5MPa for 5 hours, and then tests the desalination rate of the component, and the desalination rate reaches 95.4%.

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PUM

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Abstract

The invention relates to the technical field of membranes and particularly relates to a polyamide hollow fiber nanofiltration membrane and a preparation method of the polyamide hollow fiber nanofiltration membrane. The preparation method comprises the following steps of 1) preparing a hollow fiber basement membrane through nonsolvent-induced phase separation: the preparation method of the hollow fiber basement membrane comprises the following steps of evenly mixing a membrane matrix phase, a solvent, a pore foaming agent and multi-element acyl chloride, standing to remove foams, wherein the various components comprise 2-20 parts of the membrane matrix phase, 30-60 parts of the solvent, 1-10 parts of the pore foaming agent and 1-10 parts of multi-element acyl chloride according to the mass proportion; heating to 50-70 DEG C, flowing through a spinneret plate to a coagulating basin to coagulate into a nascent fiber; and winding the nascent fiber formed through coagulating, soaking in glycerinum, and drying to prepare the polyamide hollow fiber basement membrane; and 2) preparing the polyamide hollow fiber nanofiltration membrane. The prepared basement membrane comprises the substance of multi-element acyl chloride, the compatibility with a multi-element acyl chloride organic solution coating the surface of the membrane is higher, and the interface stability of the basement membrane and a functional layer formed through polymerization is higher.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a polyamide hollow fiber nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is widely used in material separation, purification and concentration processes. It can be operated continuously at room temperature without phase change; it has the advantages of energy saving and environmental protection in large-scale production. Among them, nanofiltration membrane, as a kind of separation membrane, can completely remove organic matter and colloids with a relative molecular mass of 200-500, and due to the chargeability of the nanofiltration membrane surface, nanofiltration can remove high-priced and low-priced salt ions differentially retained. Therefore, nanofiltration membranes have been widely used in drinking water purification and low molecular weight organic matter purification and concentration. [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D67/00B01D71/56B01D71/68B01D71/34B01D71/30
CPCB01D67/0002B01D69/08B01D71/30B01D71/34B01D71/56B01D71/68
Inventor 范宁胡晓宇高旭
Owner TIANJIN MOTIMO MEMBRANE TECH
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