Microporous membrane containing cross-linked hydrophilic polymer and preparation method thereof

A technology of hydrophilic polymers and microporous membranes, which can be used in general water supply conservation, chemical instruments and methods, and membranes. The effect of water stability

Pending Publication Date: 2022-06-07
NINGBO SHUIYI FILM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the unstable size of the film material added with polyvinyl acetal in the prior art during the dry-wet change process, and when it encounters a filter solution containing alcohol, ether, and ketone, the polyvinyl acetal will not be stable during operation. In order to solve the problem of easy dissolution and loss in the medium, a microporous membrane containing a cross-linked hydrophilic polymer and a preparation method thereof are provided, in which polyvinyl acetal polymers are blended in the body of the polymer membrane material, and the polyvinyl acetal The hydroxyl group in the molecule is cross-linked to ensure the hydrophilic stability of the membrane material

Method used

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  • Microporous membrane containing cross-linked hydrophilic polymer and preparation method thereof

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preparation example Construction

[0027] A preparation method of a microporous membrane containing a cross-linked hydrophilic polymer, comprising the steps of:

[0028] (1) Preparation of a film-making solution: adding the microporous film main material, polyvinyl acetal and a non-solvent for film-making into a solvent, and dissolving to obtain a film-making solution;

[0029] Wherein, the main material of the microporous membrane is selected from one or more of polyvinylidene fluoride, polyvinyl chloride, and polysulfone polymers, and the mass fraction of the main material of the microporous membrane in the membrane-forming solution is 10-20%;

[0030] The polyvinyl acetal is selected from one or more of polyvinyl formal, polyvinyl acetal, polyvinyl methyl acetal and polyvinyl butyral, and in the molecular chain of polyvinyl acetal , the mass content of vinyl alcohol chain segments is not less than 10%, and the mass ratio of polyvinyl acetal to the main material of the microporous membrane is less than 1:1; ...

Embodiment 1

[0036] A preparation method of a microporous membrane containing a cross-linked hydrophilic polymer, comprising the steps of:

[0037] (1) Preparation of film-making solution: add polyvinylidene fluoride, polyvinyl butyral (the mass content of vinyl alcohol segments is 20%) and polyethylene glycol 400 into N,N-dimethylacetamide, After dissolving at 70 DEG C, a film-forming solution is obtained; in the obtained film-forming solution, the mass concentration of polyvinylidene fluoride is 12%, the mass concentration of polyvinyl butyral is 5%; the mass concentration of polyethylene glycol 400 is 13%;

[0038] (2) Film formation: the obtained film formation solution was extruded through an annular gap type spinneret, and an aqueous solution of 40wt% N,N-dimethylacetamide was used as the outer coagulation bath, and 50wt% N,N-dimethylacetamide was used as the outer coagulation bath. The aqueous solution of acetamide is an internal coagulation bath to prepare a polymer hollow fiber m...

Embodiment 2

[0041] A preparation method of a microporous membrane containing a cross-linked hydrophilic polymer, comprising the steps of:

[0042](1) Preparation of film-making solution: add polyvinylidene fluoride, polyvinyl butyral (the mass content of vinyl alcohol chain segments is 10%) and polyethylene glycol 400 into N,N-dimethylacetamide, After dissolving at 70 DEG C, a film-forming solution is obtained; in the obtained film-forming solution, the mass concentration of polyvinylidene fluoride is 10%, the mass concentration of polyvinyl butyral is 8%, and the mass concentration of polyethylene glycol 400 is 12%;

[0043] (2) Film formation: the obtained film formation solution was extruded through an annular gap type spinneret, and an aqueous solution of 40wt% N,N-dimethylacetamide was used as the outer coagulation bath, and 50wt% N,N-dimethylacetamide was used as the outer coagulation bath. The aqueous solution of acetamide is an internal coagulation bath to obtain a polymer hollow...

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Abstract

The invention relates to the field of microporous separation membranes, and discloses a microporous membrane containing a cross-linked hydrophilic polymer and a preparation method of the microporous membrane, raw materials comprise a microporous membrane main body material and the cross-linked hydrophilic polymer, and the cross-linked hydrophilic polymer is cross-linked polyvinyl acetal; the preparation method comprises the following steps: (1) preparing a membrane preparation solution: adding a microporous membrane main body material, polyvinyl acetal and a non-solvent for membrane preparation into a solvent, and dissolving to obtain the membrane preparation solution; (2) preparing a membrane: preparing the obtained membrane preparation solution into a polymer microporous membrane through a phase inversion process; and (3) cross-linking: soaking the polymer microporous membrane in an aqueous solution of a cross-linking agent, and treating to obtain the microporous membrane containing the cross-linked hydrophilic polymer. The polyvinyl acetal polymer is blended in the polymer membrane material body, and hydroxyl in polyvinyl acetal molecules is crosslinked, so that the hydrophilic stability of the membrane material can be ensured.

Description

technical field [0001] The invention relates to the technical field of microporous separation membranes, in particular to a microporous membrane containing a cross-linked hydrophilic polymer and a preparation method thereof. Background technique [0002] Membrane separation technology is widely used in liquid separation such as water treatment, material separation and other fields due to its simple process and high separation efficiency. Polyvinylidene fluoride, polysulfone, polyvinyl chloride and other polymer materials have stable performance, easy availability of solvents, and good chemical resistance, and are widely used in the field of separation membranes. However, common membrane materials such as polyvinylidene fluoride, polysulfone, and polyvinyl chloride have low surface energy and are hydrophobic materials. Common pollutants in water, such as humic acid, The adsorption of proteins, etc. on the membrane surface results in the formation of membrane surface contamin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/14
CPCB01D67/0006B01D67/0093B01D69/02B01D61/147B01D2325/36B01D2323/30Y02A20/131
Inventor 沈立强虞源李俊俊计根良
Owner NINGBO SHUIYI FILM TECH DEV CO LTD
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