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Preparation method of polyimide porous membrane containing amidoxime group

A polyimide and amidoxime-based technology, applied in the field of special polymer materials, can solve problems such as poor radiation resistance, and achieve the effects of simple and practical method, simple production operation, and low equipment requirements

Pending Publication Date: 2021-11-02
大同共聚西安科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the current situation that existing polyimide cannot specifically adsorb uranium as an adsorption material, and the existing adsorption material for adsorbing uranium has poor radiation resistance, and provides a polyimide containing amidoxime group. The preparation method of the amine porous membrane is to graft the amidoxime functional group to the polyimide substrate, and then prepare a porous membrane by processing means, and then can obtain the amidoxime group-containing membrane with radiation resistance and high adsorption of uranium. polyimide porous membrane

Method used

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  • Preparation method of polyimide porous membrane containing amidoxime group
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  • Preparation method of polyimide porous membrane containing amidoxime group

Examples

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Effect test

Embodiment 1

[0016] (1) Under the protection of a nitrogen atmosphere, add 2.42g of diamine monomer and 100g of N,N-dimethylacetamide to the reaction flask to form a diamine solution with a concentration of 2wt%, and then add 3.2g of 3,3',4,4'-benzophenonetetraacid dianhydride was stirred and reacted for 12h at room temperature to obtain a polyamic acid solution, wherein 0.82g (20mol%) of the diamine contained figure 1 The diamine of the shown structure, other diamines are 1.6g (80mol%) 4,4'-diaminodiphenyl ether;

[0017] (2) Under a nitrogen atmosphere, heat the reaction solution in step (1) to 180°C, and heat and stir the reaction for 12 hours at the same time, so that the imidization reaction occurs and the water generated by the water reaction is removed, and then the reaction solution is poured into 550mL of water , precipitated, filtered, and dried to obtain polyimide powder, whose structural formula is as attached figure 2 shown;

[0018] (3) Add 1 g of polyimide in step (2) to ...

Embodiment 2

[0021] (1) Under the protection of a nitrogen atmosphere, add 4.84g of diamine monomer and 100g of N,N-dimethylacetamide to the reaction flask to form a diamine solution with a concentration of 4wt%, and then add 6.4g of 3,3',4,4'-benzophenonetetraacid dianhydride, stirred and reacted for 12h at room temperature to obtain a polyamic acid solution, wherein the diamine contained 1.64g (20mol%) of figure 1 The diamine of the shown structure, other diamines are 3.2g (80mol%) 4,4'-diaminodiphenyl ether;

[0022] (2) consistent with embodiment 1 step (2);

[0023] (3) consistent with embodiment 1 step (3);

[0024] (4) Consistent with step (4) of Example 1, its adsorption capacity for uranium reaches 135 mg / g.

Embodiment 3

[0026] (1) Under the protection of a nitrogen atmosphere, add 2.42g of diamine monomer and 100g of N,N-dimethylacetamide to the reaction flask to form a diamine solution with a concentration of 2wt%, and then add 2.2 g of pyromellitic anhydride, stirred and reacted for 12 h at room temperature to obtain a polyamic acid solution, wherein 0.82 g (20 mol%) of diamines with attached figure 1 The diamine of the shown structure, other diamines are 1.6g (80mol%) 4,4'-diaminodiphenyl ether;

[0027] (2) consistent with embodiment 1 step (2);

[0028] (3) consistent with embodiment 1 step (3);

[0029] (4) Consistent with step (4) of Example 1, its adsorption capacity for uranium reaches 142mg / g.

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Abstract

The invention relates to a preparation method of a polyimide porous membrane containing an amidoxime group, and belongs to the field of special high polymer materials. The porous membrane can be used as a high-strength adsorption material in the fields of uranium adsorption, enrichment, separation and the like. The preparation method of the polyimide porous membrane containing the amidoxime group comprises the following steps: when polyimide is prepared, a diamine monomer containing a cyano group is introduced into a monomer and is copolymerized with other diamine monomers, and after the polyimide is prepared, the polyimide porous membrane is prepared by a phase inversion method; and a cyano group on a side chain of the polyimide is hydrolyzed into an amidoxime group to obtain the polyimide porous membrane containing the amidoxime group. The uranium adsorption capacity of the prepared porous membrane reaches 110 mg / g or above. The method for preparing the polymer porous membrane for adsorbing uranium is simple, practical and environment-friendly, the selected solvent and non-solvent are low in cost and easy to recycle, and the comprehensive yield is higher than 90%.

Description

technical field [0001] The invention relates to a preparation method of a polyimide porous membrane containing amidoxime groups, belonging to the field of special polymer materials. The porous membrane can be used as a high-strength adsorption material in the fields of uranium adsorption, enrichment, separation and the like. Background technique [0002] The remarkable characteristics of the radioactive waste liquid produced in the process of nuclear fuel cycle are low concentration and large volume, so the effective separation of uranium in water has very important practical significance. There are many separation and enrichment methods for uranium, mainly including solvent extraction, foam flotation, liquid film enrichment, evaporation and concentration, precipitation and adsorption. At present, the adsorption method is widely used because of its advantages of low cost, simple process and wide applicability. The amidoxime functional group gets its name because it contain...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L79/08C08G73/10
CPCC08J9/28C08G73/1071C08G73/1042C08G73/1007C08J2379/08
Inventor 周雨薇
Owner 大同共聚西安科技有限公司
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