阅读说明：本技术 一种高效油水分离超滤膜的制备方法 (Preparation method of efficient oil-water separation ultrafiltration membrane ) 是由 陈泉学 于 2019-08-28 设计创作，主要内容包括：本发明提出了一种高效油水分离超滤膜的制备方法,包括制备超滤膜液,利用臭氧对超滤膜液进行接枝改性,通过制备改性氧化铝晶须,利用改性的氧化铝晶须对超滤膜液进行接枝改性,提高了所制备的超滤膜的耐油性能和机械强度,提高了亲水性能,能够更好地处理含油污水,且在长时间处理后具有较好的膜通量恢复能力,具备良好的应用前景。(The invention provides a preparation method of a high-efficiency oil-water separation ultrafiltration membrane, which comprises the steps of preparing an ultrafiltration membrane liquid, carrying out graft modification on the ultrafiltration membrane liquid by using ozone, preparing modified alumina whiskers, and carrying out graft modification on the ultrafiltration membrane liquid by using the modified alumina whiskers, so that the oil resistance and the mechanical strength of the prepared ultrafiltration membrane are improved, the hydrophilic property is improved, oily sewage can be better treated, the membrane flux recovery capability is better after long-time treatment, and the application prospect is good.)

1. A preparation method of a high-efficiency oil-water separation ultrafiltration membrane is characterized by comprising the following steps:

step one, mixing raw materials for preparing an ultrafiltration membrane, stirring until the raw materials are dissolved to obtain an ultrafiltration membrane solution, introducing ozone into the ultrafiltration membrane solution for 10-30min, and stirring to obtain an ozone modified ultrafiltration membrane solution;

step two, mixing the alumina whiskers, toluene diisocyanate and xylene, putting the mixture into a ball milling tank, carrying out ball milling for 5-10min to obtain a mixed solution after the ball milling is finished, extracting the mixed solution with petroleum ether, and drying the extracted petroleum ether to obtain modified alumina whiskers;

Mixing the ozone modified ultrafiltration membrane solution and the modified alumina whiskers, keeping the temperature at 0-10 ℃, and stirring for 0.5-1h to obtain a membrane casting solution;

and step four, scraping the membrane casting solution on a flat membrane scraping machine to obtain a membrane with the thickness of 200-500 mu m, and drying to obtain the ultrafiltration membrane.

2. The preparation method of the high-efficiency oil-water separation ultrafiltration membrane according to claim 1, wherein in the first step, the ultrafiltration membrane comprises the following raw materials in parts by weight:

3. The method for preparing the high-efficiency oil-water separation ultrafiltration membrane according to claim 2, wherein the solvent is one of N-methylpyrrolidone, N-dimethylformamide and N, N-dimethylacetamide.

4. The method for preparing the high-efficiency oil-water separation ultrafiltration membrane according to claim 2, wherein the calcium-containing additive is calcium carbonate or calcium silicate.

5. The preparation method of the high-efficiency oil-water separation ultrafiltration membrane according to claim 1, wherein in the second step, the alumina whiskers: toluene diisocyanate: the mass ratio of the dimethylbenzene is (3-5): (1-2): (3-5).

6. The preparation method of the high-efficiency oil-water separation ultrafiltration membrane according to claim 1, wherein in the second step, the alumina whiskers: the mass ratio of the petroleum ether is 1: (8-14).

7. the method for preparing the high-efficiency oil-water separation ultrafiltration membrane according to claim 6, wherein in the second step, the step of extracting petroleum ether comprises the following steps: adding half of petroleum ether into the mixed solution, cooling to 5-15 deg.C, stirring for 5-10min, standing for layering, collecting petroleum ether layer, adding the rest petroleum ether into xylene layer, stirring for 10-15min, standing for layering, collecting petroleum ether layer, and mixing the two petroleum ether layers.

8. The preparation method of the high-efficiency oil-water separation ultrafiltration membrane according to claim 1, wherein in the third step, the ozone-modified ultrafiltration membrane solution is prepared by the following steps: the mass ratio of the modified alumina whisker is (3-5): (2-4).

Technical Field

The invention relates to the technical field of sewage treatment equipment, in particular to a preparation method of a high-efficiency oil-water separation ultrafiltration membrane.

Background

in recent years, oily wastewater gradually becomes common pollution, which has great harm to environmental protection and ecological balance, and at present, membrane separation technology is mostly adopted in common oily wastewater treatment methods.

However, the existing membrane separation technology still has more problems in the process of separating the oily wastewater, in the process of separating the oily wastewater by using the conventional ultrafiltration membrane, oil stains are easy to gather on the surface of the ultrafiltration membrane, so that the ultrafiltration membrane cannot be subjected to oil-water separation for a long time, the ultrafiltration membrane needs to be cleaned or replaced after being separated for a period of time, the treatment cost is greatly increased, and the substrate of the ultrafiltration membrane is a high-molecular organic material and has hydrophobicity, so that a water film cannot be formed on the surface, and the gathering of the oil stains is caused.

Disclosure of Invention

In view of the above, the invention provides a preparation method of a high-efficiency oil-water separation ultrafiltration membrane capable of preventing oil stain accumulation.

the technical scheme of the invention is realized as follows: the invention provides a preparation method of a separation ultrafiltration membrane for colleges and universities, which comprises the following steps:

step one, mixing raw materials for preparing an ultrafiltration membrane, stirring until the raw materials are dissolved to obtain an ultrafiltration membrane solution, introducing ozone into the ultrafiltration membrane solution for 10-30min, and stirring to obtain an ozone modified ultrafiltration membrane solution;

step two, mixing the alumina whiskers, toluene diisocyanate and xylene, putting the mixture into a ball milling tank, carrying out ball milling for 5-10min to obtain a mixed solution after the ball milling is finished, extracting the mixed solution with petroleum ether, and drying the extracted petroleum ether to obtain modified alumina whiskers;

Mixing the ozone modified ultrafiltration membrane solution and the modified alumina whiskers, keeping the temperature at 0-10 ℃, and stirring for 0.5-1h to obtain a membrane casting solution;

And step four, scraping the membrane casting solution on a flat membrane scraping machine to obtain a membrane with the thickness of 200-500 mu m, and drying to obtain the ultrafiltration membrane.

on the basis of the above technical scheme, preferably, in the step one, the ultrafiltration membrane comprises the following raw materials in parts by weight:

On the basis of the technical scheme, preferably, the solvent is one of N-methylpyrrolidone, N-dimethylformamide and N, N-dimethylacetamide.

On the basis of the above technical scheme, preferably, the calcium-containing additive is calcium carbonate or calcium silicate.

more preferably, in step two, the alumina whiskers: toluene diisocyanate: the mass ratio of the dimethylbenzene is (3-5): (1-2): (3-5).

on the basis of the above technical solution, preferably, in step two, the alumina whisker: the mass ratio of the petroleum ether is 1: (8-14).

on the basis of the above technical solution, preferably, in the second step, the step of extracting petroleum ether includes: adding half of petroleum ether into the mixed solution, cooling to 5-15 deg.C, stirring for 5-10min, standing for layering, collecting petroleum ether layer, adding the rest petroleum ether into xylene layer, stirring for 10-15min, standing for layering, collecting petroleum ether layer, and mixing the two petroleum ether layers.

On the basis of the above technical solution, preferably, in step three, the ozone-modified ultrafiltration membrane solution: the mass ratio of the modified alumina whisker is (3-5): (2-4).

Compared with the prior art, the preparation method of the high-efficiency oil-water separation ultrafiltration membrane has the following beneficial effects:

(1) According to the preparation method of the efficient oil-water separation ultrafiltration membrane, the modified alumina whiskers are adopted to graft and modify the membrane liquid of the ultrafiltration membrane, the hydrophilic performance of the alumina whiskers is utilized to improve the oleophobic performance of an ultrafiltration membrane body material, meanwhile, the modified alumina whiskers have good grafting performance and high strength, and the ultrafiltration membrane after grafting modification can be suitable for sewage treatment under high pressure;

(2) The whole ultrafiltration membrane preparation method has simple steps, and the prepared ultrafiltration membrane has good performance and good social application value.

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.