阅读说明：本技术 一种耐有机溶剂的超滤膜及其制备方法和应用 (Organic solvent-resistant ultrafiltration membrane and preparation method and application thereof ) 是由 陈泉学 于 2019-08-27 设计创作，主要内容包括：本发明提出了一种耐有机溶剂的超滤膜及其制备方法和应用,所述超滤膜由常规铸膜液制备得到,将超滤膜分别通过乙二胺四氢呋喃溶液改性和尼龙6有机溶液改性,利用乙二胺对超滤膜的膜孔内表面进行接枝改性,尼龙6对超滤膜的表面进行接枝改性,达到增强超滤膜的表面耐溶剂性能,本发明的制备方法简单,所制备的超滤膜具有良好的耐溶剂性能,可以应用于工业污水处理。(The invention provides an organic solvent-resistant ultrafiltration membrane, a preparation method and application thereof, wherein the ultrafiltration membrane is prepared from a conventional membrane casting solution, the ultrafiltration membrane is modified by an Ethylene Diamine Tetraacetic Acid (EDTA) tetrahydrofuran solution and a nylon 6 organic solution respectively, the inner surface of a membrane hole of the ultrafiltration membrane is subjected to graft modification by using ethylenediamine, and the surface of the ultrafiltration membrane is subjected to graft modification by using nylon 6, so that the surface solvent resistance of the ultrafiltration membrane is enhanced.)

1. the preparation method of the organic solvent resistant ultrafiltration membrane is characterized by comprising the following steps:

step one, mixing raw materials of a membrane casting solution, stirring for dissolving, and defoaming to obtain the membrane casting solution;

Step two, adopting a flat film scraping machine to scrape the film of the casting film liquid, wherein the thickness of the scraped film is 100-400 mu m, drying the scraped film for 1-2min at normal temperature and normal pressure, and immersing the scraped film in a gel bath for phase conversion to obtain an ultrafiltration film;

step three, immersing the ultrafiltration membrane prepared in the step two in a membrane pore modification solution, carrying out graft modification for 1-2h, taking out and drying to obtain a first modified ultrafiltration membrane;

and step four, immersing the first modified ultrafiltration membrane obtained in the step three in a solvent-resistant modified solution, carrying out graft modification for 1-2h, taking out, and drying to obtain the organic solvent-resistant ultrafiltration membrane.

2. The preparation method of the organic solvent resistant ultrafiltration membrane according to claim 1, wherein the raw materials of the membrane casting solution comprise, by mass:

10-20 parts of polymer

60-80 parts of solvent

5-10 parts of a pore-foaming agent.

3. the method for preparing the organic solvent resistant ultrafiltration membrane according to claim 2, wherein the polymer is one of polyetherimide, polysulfone and polyethersulfone, the solvent is one of N-methylpyrrolidone, N-dimethylformamide and N, N-dimethylacetamide, and the pore-forming agent is one of polyvinylpyrrolidone and polyvinyl alcohol.

4. The method of preparing an organic solvent resistant ultrafiltration membrane according to claim 1, wherein said gel bath is deionized water or ethanol or a mixed solution of deionized water and ethanol.

5. The preparation method of the organic solvent resistant ultrafiltration membrane according to claim 1, wherein the membrane pore modification solution comprises the following raw materials in parts by weight:

5-15 parts of ethylenediamine

40-50 parts of tetrahydrofuran.

6. The method of preparing an organic solvent resistant ultrafiltration membrane according to claim 5, wherein the method of preparing the membrane pore modification solution comprises: and uniformly mixing ethylenediamine and tetrahydrofuran, and cooling to 0-10 ℃ to obtain a membrane pore modification solution.

7. the preparation method of the organic solvent resistant ultrafiltration membrane according to claim 1, wherein the solvent resistant modified solution comprises the following raw materials in parts by weight:

620-30 parts of nylon

60-70 parts of organic solvent

3-5 parts of inorganic salt

Wherein the organic solvent is one of methanol, ethylene glycol, isopropanol and tert-butanol, and the inorganic salt is one of calcium carbonate, magnesium carbonate, ammonium chloride and magnesium chloride.

8. The method of preparing an organic solvent resistant ultrafiltration membrane according to claim 7, wherein the method of preparing the solvent resistant modification solution comprises:

Step one, adding inorganic salt into an organic solvent, heating to 60-100 ℃, preserving heat and stirring for 10-30min to obtain a mixed solution;

And step two, adding nylon 6 into the mixed solution prepared in the step one, keeping the temperature at 60-100 ℃, stirring for 10-30min, and cooling to normal temperature to obtain the solvent-resistant modified solution.

9. An organic solvent-resistant ultrafiltration membrane produced by the production method according to any one of claims 1 to 8.

10. the application of the ultrafiltration membrane resistant to the organic solvent is characterized in that the ultrafiltration membrane is used for treating sewage containing the organic solvent.

Technical Field

the invention relates to the technical field of sewage treatment equipment, in particular to an organic solvent resistant ultrafiltration membrane and a preparation method and application thereof.

Background

Ultrafiltration is one of membrane separation techniques using pressure as a driving force, and utilizes the membrane pore size to separate large molecules and small molecules, so that ultrafiltration membranes are commonly used in sewage purification treatment applications.

Most of pollutants existing in common domestic sewage are organic polymer pollutants, part of bacteria and the like, the conventional ultrafiltration membrane has enough performance for separating and treating the pollutants, however, in the field of industrial sewage treatment, a large amount of miscible solvents exist in the sewage, and the ultrafiltration membrane material is organic material, so that the industrial sewage can generate a certain erosion effect on the ultrafiltration membrane body, membrane pores can be enlarged and the membrane thickness can be thinned as time passes, so that the basic performance of the ultrafiltration membrane is lost, the ultrafiltration membrane is difficult to use in the field of industrial sewage for a long time, and even if the ultrafiltration membrane can be used, the maintenance cost is extremely high.

Disclosure of Invention

In view of the above, the invention provides an organic solvent resistant ultrafiltration membrane, and a preparation method and application thereof.

The technical scheme of the invention is realized as follows: the invention provides a preparation method of an organic solvent resistant ultrafiltration membrane, which comprises the following steps:

Step one, mixing raw materials of a membrane casting solution, stirring for dissolving, and defoaming to obtain the membrane casting solution;

Step two, adopting a flat film scraping machine to scrape the film of the casting film liquid, wherein the thickness of the scraped film is 100-400 mu m, drying the scraped film for 1-2min at normal temperature and normal pressure, and immersing the scraped film in a gel bath for phase conversion to obtain an ultrafiltration film;

step three, immersing the ultrafiltration membrane prepared in the step two in a membrane pore modification solution, carrying out graft modification for 1-2h, and removing and drying to obtain a first modified ultrafiltration membrane;

and step four, immersing the first modified ultrafiltration membrane obtained in the step three in a solvent-resistant modified solution, carrying out graft modification for 1-2h, taking out, and drying to obtain the organic solvent-resistant ultrafiltration membrane.

On the basis of the technical scheme, preferably, the raw materials of the casting solution comprise, by mass:

10-20 parts of polymer

60-80 parts of solvent

5-10 parts of a pore-foaming agent.

On the basis of the above technical solution, preferably, the polymer is one of polyetherimide, polysulfone, and polyethersulfone, the solvent is one of N-methylpyrrolidone, N-dimethylformamide, and N, N-dimethylacetamide, and the porogen is one of polyvinylpyrrolidone and polyvinyl alcohol.

on the basis of the technical scheme, preferably, the gel bath is deionized water or ethanol or a mixed solution of the deionized water and the ethanol.

still further preferably, the membrane pore modifying solution comprises the following raw materials in parts by weight:

5-15 parts of ethylenediamine

40-50 parts of tetrahydrofuran.

on the basis of the above technical solution, preferably, the preparation method of the membrane pore modification solution comprises: and uniformly mixing ethylenediamine and tetrahydrofuran, and cooling to 0-10 ℃ to obtain a membrane pore modification solution.

on the basis of the technical scheme, preferably, the solvent-resistant modified solution comprises the following raw materials in parts by mass:

620-30 parts of nylon

60-70 parts of organic solvent

3-5 parts of inorganic salt

wherein the organic solvent is one of methanol, ethylene glycol, isopropanol and tert-butanol, and the inorganic salt is one of calcium carbonate, magnesium carbonate, ammonium chloride and magnesium chloride.

On the basis of the above technical solution, preferably, the preparation method of the solvent-resistant modified solution comprises:

Step one, adding inorganic salt into an organic solvent, heating to 60-100 ℃, preserving heat and stirring for 10-30min to obtain a mixed solution;

and step two, adding nylon 6 into the mixed solution prepared in the step one, keeping the temperature at 60-100 ℃, stirring for 10-30min, and cooling to normal temperature to obtain the solvent-resistant modified solution.

The invention also provides an organic solvent resistant ultrafiltration membrane prepared by the preparation method.

On the basis of the technical scheme, the organic solvent resistant ultrafiltration membrane is preferably used for treating sewage containing an organic solvent.

compared with the prior art, the organic solvent resistant ultrafiltration membrane and the preparation method and application thereof have the following beneficial effects:

(1) The preparation method of the organic solvent resistant ultrafiltration membrane is simple, the micromolecule ethylenediamine is used as a modified grafting raw material, the micromolecule ethylenediamine can enter membrane pores of the ultrafiltration membrane to graft and modify the surface of the membrane pores, the solvent is prevented from entering the membrane pores to corrode the surface of the membrane pores and influence the pore diameter, and therefore the performance of the ultrafiltration membrane is reduced;

(2) The organic solvent resistant ultrafiltration membrane has good organic solvent tolerance, can be applied to industrial sewage treatment, effectively prevents the organic solvent in the industrial sewage from being corroded, and has good market application prospect.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.