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Positive charged organic-inorganic hybrid membrane preparing method

A technology of positively charged and hybrid membranes, which is applied in the field of preparing positively charged organic-inorganic hybrid membranes, can solve the problems of high toxicity of TDI and limited sources of raw materials, and achieve good compatibility, good flexibility, and low organic content. high effect

Inactive Publication Date: 2005-02-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sources of raw materials used in the preparation of hybrid membranes are quite limited, and TDI is highly toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using a 250ml four-neck bottle reaction kettle equipped with a magnetic stirrer, a nitrogen inlet and a dropping funnel, add a solution of polymethyl acrylate (Mn=8360) in dimethyl sulfoxide (DMSO), and add N-β dropwise under stirring. -Aminoethyl-γ-aminopropyltrimethoxysilane (A-1120), stirred and reacted at 60°C. The molar ratio of each component is polymethyl acrylate (calculated based on the content of ester groups): A-1120: DMSO = 1: 10: 10. Sampling at any time for infrared testing, ~1735cm -1 The absorption peak of the ester group gradually decreases, ~1640cm -1 With ~ 1570cm -1 The amide peak gradually strengthened, indicating that the aminolysis reaction proceeded smoothly. Stop the reaction when the ester group peak disappears substantially.

[0020] Precipitate the mixed liquid in the reactor with 2 / 1 (volume ratio) ethyl acetate and petroleum ether, wash several times, dry, take 5.0g (calculated as 0.018mol based on silicon content) and dissolve it in 15...

Embodiment 2

[0028] Using the same device and operating process as in Example 1, polymethyl methacrylate (Mn=9600) was used instead of polymethyl acrylate to obtain a positively charged organic-inorganic hybrid membrane with an anion exchange capacity of 1.0×10 -4 mol / g.

Embodiment 3

[0030] Using the same device and operating process as in Example 1, methyl methacrylate-methyl acrylate copolymer (Mn=11000, methyl acrylate content 35%) was used instead of polymethyl acrylate to obtain a positively charged organic-inorganic hetero Chemical membrane with anion exchange capacity of 1.5×10 -4 mol / g.

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PUM

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Abstract

The invention relates to an approach of producing positive charge organic-inorganic hybridization membrane. Its characters are as follows: making alkoxy silane and macromolecular compound containing ester group or epoxy lateral group or end group amine analyzing, alcoholysis or ring opening reaction, conducting quaterisation on production to get positive charge reaction sol-gel precursor, conducting sol-gel reaction on the precursor and finally getting positive charge organic-inorganic hybridization membrane. In the invention, poisonous esters compound containing carbimide need not adopting. It can use multifarious macromolecular compounds for crosslinking with alkoxy silane, which makes materials source be wider. Using manifold bracing matters makes forms and constructions multiple. Production of the invention has a high organic content, good flexibility and compatibility.

Description

Technical field: [0001] The invention belongs to the technical field of membranes, in particular to a method for preparing positively charged organic-inorganic hybrid membranes by using a sol-gel method. Background technique: [0002] Positively charged membranes are widely used in desalination of seawater (brackish water), dehardening of tap water, recovery of useful metals in sewage, treatment of electrophoretic paint wastewater, and electrochemical sensors. Currently, positively charged organic polymer membranes are widely used. Due to the characteristics of organic materials, these membranes usually have poor mechanical strength and chemical stability. Applications. One way to improve these defects of positively charged organic membranes is to combine the advantages of inorganic materials such as good mechanical strength and stability, chemical and biological erosion resistance, and long service life into organic positively charged materials, that is, to prepare positiv...

Claims

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Application Information

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IPC IPC(8): B01D71/70
Inventor 徐铜文吴翠明杨伟华
Owner UNIV OF SCI & TECH OF CHINA
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