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Hydrophilic polypropylene flat separation membrane and preparation method thereof

A separation membrane and polypropylene technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as difficulty in industrial scale-up, cumbersome membrane-making process, and hydrophilic attenuation

Pending Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-soluble polymers such as polyvinylpyrrolidone and polyethylene glycol can significantly increase the membrane flux, but the membrane has poor pressure resistance; the membrane prepared by nanomaterials has high flux and good pressure resistance, but it is difficult for the nanoparticles to be evenly distributed in the formation. In the membrane liquid, this leads to a cumbersome membrane making process and is not suitable for industrial production
Plasma modification, ultraviolet irradiation grafting and other modification methods, with the increase of operating time, the hydrophilicity will seriously decay; or more complex chemical reactions are required, and industrial scale-up is difficult

Method used

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  • Hydrophilic polypropylene flat separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Add polypropylene resin (T30S) and diluent in a container with a stirring device, the mass percentage of polypropylene resin is 20%, soybean oil is used as diluent, and the mass percentage is 80%. Heat the mixture to 200°C and stir for 2 hours under the condition of nitrogen flow, stop the stirring and let stand for defoaming for 2 hours to obtain the casting solution; cool the casting solution in liquid nitrogen for 30 minutes to obtain the solidified sample; Take a certain cured sample and place it between the upper and lower layers of polyimide diaphragms, and place a 150mm×150mm metal foil in the middle on top of the upper polyimide diaphragm. The thickness of the metal foil is 100μm. Then put it into the preheated flat mold, the preheating temperature is 180°C, heat to 200°C, pressurize to 10MPa and keep it for 10min, use the water cooling system to cool the mold to room temperature, and obtain the prefabricated polypropylene film containing diluent; the prefabricat...

Embodiment 2

[0081] Except that the mixture of the dried maleic anhydride and the polypropylene flat separation membrane was microwaved (power 700W) for 7min under a nitrogen atmosphere, the rest were the same as in Example 1. The contact angle and pure water flux data of the hydrophilic polypropylene flat separation membrane before and after the reaction with alkali are shown in Table 1.

Embodiment 3

[0085] Except that the mass percentage of polypropylene resin is 25%, and soybean oil is used as diluent, and the mass percentage is 75%, all the others are the same as in Example 1; Quantitative data can be seen in Table 1.

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Abstract

The invention relates to the field of polypropylene graft modification, and provides a hydrophilic polypropylene hollow fiber microporous membrane and a preparation method thereof. The hydrophilic polypropylene hollow fiber microporous membrane is grafted with at least one of an organic acid and organic acid derivative side group and an organic acid salt side group, and is obtained by grafting thepolypropylene hollow fiber microporous membrane and an organic acid and organic acid derivative monomer under microwave irradiation without adding an initiator; and further reacting the obtained grafted polypropylene hollow fiber microporous membrane with hydroxide to obtain the hydrophilic polypropylene hollow fiber microporous membrane with the surface rich in organic acid salt side groups. Thehydrophilic polypropylene hollow fiber microporous membrane has the advantages of no reduction of the polypropylene molecular weight, no residual monomer, no initiator residue, no color, no odor, good and lasting hydrophilic effect, and great increase of the pure water flux of the membrane tested by an internal and external pressure method. The preparation process is simple and easy to operate, and the preparation method and equipment are simple, low in cost and easy to industrialize.

Description

technical field [0001] The invention relates to the field of polymer membrane materials, in particular to a polymer separation membrane and a preparation method thereof, more specifically to a hydrophilic polypropylene flat microporous membrane and a preparation method thereof. Background technique [0002] Membrane technology, as an emerging high-efficiency separation technology, is already an industrialized energy-saving separation process, and has developed rapidly in recent years. In the application of membrane technology, membrane material is the basis and core of the development and application of membrane technology. The performance of the membrane material directly affects the separation performance of the membrane, so its preparation process has always been a hotspot of research by scholars. At present, there are two types of membrane materials widely used: polymer and inorganic materials. Among them, the preparation methods of polymer microporous membranes mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/06B01D67/00
CPCB01D71/26B01D69/06B01D67/0013
Inventor 乔金樑王崧合张晓红奚振宇戚桂村王玉杰宋志海蔡传伦王湘赖金梅李秉海蒋海斌茹越张江茹高建明张红彬韩朋姜超郭照琰
Owner CHINA PETROLEUM & CHEM CORP