Preparation method for diamine cross-linked modified polyimide nano-filtration membrane added with polyethylene glycol

A polyimide nano, polyethylene glycol technology, applied in the field of polyimide nanofiltration membrane preparation, can solve the problem of high preparation cost, low retention rate, low permeation flux of polyimide nanofiltration membrane, etc. problem, to achieve the effect of simple operation, reduced energy consumption and outstanding effect

Inactive Publication Date: 2014-05-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a polyimide cross-linked modified polyimide nanofiltration membrane with polyethylene glycol added to solve the problems of low per

Method used

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  • Preparation method for diamine cross-linked modified polyimide nano-filtration membrane added with polyethylene glycol
  • Preparation method for diamine cross-linked modified polyimide nano-filtration membrane added with polyethylene glycol

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specific Embodiment approach 1

[0023] Specific embodiment one: the preparation method of the polyimide nanofiltration membrane of a kind of diamine cross-linking modification adding polyethylene glycol in this embodiment, is to carry out according to the following steps:

[0024] 1. Preparation of polyimide casting solution: dissolve 15g-25g of substance A into 75g-85g of substance B, and after mixing evenly, obtain a polyimide casting solution with a mass fraction of 15%-25%;

[0025] The substance A described in step 1 is polyetherimide, bismaleimide or LenzingP84; the substance B described is dimethylformamide, tetrahydrofuran, N-methylpyrrolidone, N-methylformamide amides, dimethylacetamide or dimethylsulfoxide;

[0026] 2. Add polyethylene glycol: Add polyethylene glycol to the polyimide casting solution obtained in step 1, and stir for 0.5h to 10h at a stirring speed of 50r / min to 300r / min to obtain Polyethylene glycol-polyimide casting solution;

[0027] The mass percent of polyethylene glycol in t...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the mass percentage of polyethylene glycol in the polyethylene glycol-polyimide casting solution obtained in step 2 is 1wt%~19wt% . Others are the same as the first embodiment.

specific Embodiment approach 3

[0035] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is that the mass percentage of polyethylene glycol in the polyethylene glycol-polyimide casting solution obtained in step two is 2wt%~ 18wt%. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method for a diamine cross-linked modified polyimide nano-filtration membrane added with polyethylene glycol and aims to solve the problems that the permeation flux of the prepared polyimide nano-filtration membrane is low, the rejection rate is low and the preparation cost is high in an existing method. The preparation method provided by the invention comprises the following steps: 1, preparing polyimide membrane casting liquid with the mass percent of 15%-25%; 2, preparing polyethylene glycol-polyimide membrane casting liquid, wherein the mass percent of the polyethylene glycol in the polyethylene glycol-polyimide membrane casting liquid is 1-20wt%; 3, carrying out membrane preparation by using an immersing precipitated phase conversion method to obtain the polyimide nano-filtration membrane; 4, processing the obtained polyimide nano-filtration membrane by using diamine to obtain a modified polyimide nano-filtration membrane; and 5, immersing and washing 2-4 times to obtain the diamine cross-linked modified polyimide nano-filtration membrane added with the polyethylene glycol. The preparation method for the diamine cross-linked modified polyimide nano-filtration membrane added with the polyethylene glycol is applied to fields including pharmaceutical manufacturing, biology, catalyst recycling and the like.

Description

technical field [0001] The invention relates to a method for preparing a membrane, in particular to a method for preparing a polyimide nanofiltration membrane. Background technique [0002] The nanofiltration membrane separation process has been widely used in various industrial fields and scientific research. At present, it is mainly concentrated in the aqueous solution system, while a large part of the actual industrial process involves the organic solvent system. The many advantages of the nanofiltration process, such as no phase transition in the separation process, no need for additives, and little influence of temperature, make it have great potential application value in non-aqueous solutions in the fields of petrochemical, pharmaceutical, and food. It is difficult to expand the use of filter membranes in non-aqueous systems. For this reason, further research and development of solvent-resistant nanofiltration membranes is extremely important for broadening the applic...

Claims

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Application Information

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IPC IPC(8): B01D71/64
Inventor 邵路张永玲程喜全白永平姜再兴
Owner HARBIN INST OF TECH
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