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Crosslinking type positively-charged chlorine-containing polymer filter membrane and preparation method thereof

A polymer, positively charged technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to improve performance, reduce membrane production steps, and reduce production costs

Active Publication Date: 2016-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no use of the reaction between chlorine-containing polymers and tertiary amine groups to prepare a high-strength solvent-resistant chlorine-containing polychlorinated filter membrane with a cross-linked structure, and at the same time endow the filter membrane surface with positive charge

Method used

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  • Crosslinking type positively-charged chlorine-containing polymer filter membrane and preparation method thereof
  • Crosslinking type positively-charged chlorine-containing polymer filter membrane and preparation method thereof
  • Crosslinking type positively-charged chlorine-containing polymer filter membrane and preparation method thereof

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preparation example Construction

[0108] The invention relates to a preparation method of a cross-linked positively charged chlorine-containing polymer filter membrane, which is characterized in that it comprises the following steps:

[0109] (1) dissolving the first chlorine-containing polymer in a solvent, and carrying out graft polymerization of tertiary amine monomers through in-situ atom transfer radical polymerization to obtain the second chlorine-containing polymer solution;

[0110] (2) The second chlorine-containing polymer solution obtained in step (1) is directly used as a film-making solution through non-solvent-induced phase separation to form a solid precursor film;

[0111] or,

[0112] (2) the second chlorine-containing polymer solution obtained in step (1), adding the first chlorine-containing polymer and stirring to form a uniform film-making solution, and forming a solid precursor film through non-solvent-induced phase separation;

[0113] (3) heat-treating the solid precursor membrane to o...

Embodiment 1

[0135] 1) Forming a chlorine-containing polymer film-making solution by in-situ atom transfer radical polymerization. Dissolve 10g of polyvinyl chloride (the first chlorine-containing polymer) in 85g of N'N-dimethylacetamide at room temperature, feed nitrogen into the solution for 30 minutes to remove oxygen in the solution, and then add 15.0 g dimethylaminoethyl methacrylate, 44.1 mg pentamethyldiethylenetriamine and 25.2 mg cuprous chloride, and then the reaction solution was placed at 65° C. for 12 hours. After the reaction is finished, air is introduced into the system to terminate the reaction to form the second chlorine-containing polymer solution. 2) In the stirring state, continue to add 5 g of polyvinyl chloride, 5 g of polyethylene glycol and 0.5 g of polyvinyl pyrrolidone into the solution, and stir at 60° C. for 24 hours. Additives polyethylene glycol, molecular weight 200 g / mol, polyvinylpyrrolidone, molecular weight 30,000 g / mol. Spread the above film-making so...

Embodiment 2

[0163] 1) Same as Step 1 of Example 1. 2) Coat the above-mentioned film-making solution on the non-woven fabric, immerse in water at 30°C to solidify to form a solid precursor film with support, and then soak the film in water to remove soluble substances such as solvents. Small molecule. 3) After drying the formed solid film, heat treatment is carried out at a temperature of 120° C. and a treatment time of 2 hours to obtain a cross-linked positively charged chlorine-containing polymer composite filter membrane

[0164] Test results and discussion: 1) Solubility test results are shown in Table 1, showing that after heat treatment of chlorine-containing polymer filter membranes, the filter membrane solvent resistance (DMF, DMAc and NMP) ability is greatly enhanced; 2) Membrane filtration separation performance test results are as follows: Table 2.

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Abstract

The invention discloses a crosslinking type positively-charged chlorine-containing polymer filter membrane and a preparation method thereof. The filter membrane contains chlorine-containing polymers with tertiary amine side chains, or contains blends of chlorine-containing polymers with tertiary amine side chains and other chlorine-containing polymers. The preparation method of the crosslinking type positively-charged chlorine-containing polymer filter membrane mainly includes the following concrete steps that 1, tertiary amine monomers are grafted to chloride-containing copolymers through an in-situ atom transfer radical polymerization method; 2, a chlorine-containing polymer solution, obtained in the step 1, with tertiary amine side chains directly serves as a membrane forming solution, or other chlorine-containing polymers are added and stirred to form a uniform membrane forming solution, and a solid precursor membrane is formed through non-solvent inductive phase separation; 3, the solid precursor membrane is subjected to heat treatment to obtain the crosslinking type positively-charged chlorine-containing polymer filter membrane. The prepared crosslinking type positively-charged chlorine-containing polymer filter membrane has the advantages of being resistant to solvents, high in strength, controllable in bore diameter and retention performance, high in efficiency and low in cost, being positively charged and the like.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a cross-linked positively charged chlorine-containing polymer filter membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology, widely used in water treatment, energy, biomedicine, food and other fields. According to the difference in separation size, filtration membranes can be divided into microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, etc., which successively remove bacteria / viruses, macromolecular organics, small molecular organics / high-valent salt ions, and monovalent salts. ions etc. In the actual application process of the filter membrane, due to the hydrophobicity of the membrane material itself, it is very easy to non-specifically adsorb organic matter, which will cause the filter membrane to be polluted and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/02B01D67/00
Inventor 朱宝库方立峰崔月杜世媛姚之侃许云秋朱利平
Owner ZHEJIANG UNIV
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