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Preparation method of hydrophobic separating membrane

A technology for hydrophobic and separation membranes, which is applied in the field of preparation of hydrophobic separation membranes. It can solve the problems of narrow material selection range, low comprehensive performance of membranes, and poor hydrophobic stability, and achieve easy scale-up and large-scale production, high hydrophobicity, Effect of good hydrophobic stability and separation performance

Active Publication Date: 2014-09-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention overcomes the defects of existing hydrophobic separation membranes such as complex preparation process, narrow range of material selection, poor hydrophobic stability, and low comprehensive performance of the membrane, and provides a preparation method for preparing high-performance hydrophobic separation membranes. The prepared hydrophobic The permanent separation membrane not only has high hydrophobicity, but also has good hydrophobic stability and separation performance. It can be used in the fields of membrane distillation, membrane absorption, membrane extraction, steam permeation, pervaporation and oil-water separation.

Method used

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  • Preparation method of hydrophobic separating membrane
  • Preparation method of hydrophobic separating membrane
  • Preparation method of hydrophobic separating membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 0.5g of polyethersulfone (PES, E6020P, BASF) and 0.031g of p-methoxyphenol (as a polymerization inhibitor), add 1.0ml of TEMAc-8 monomer and 49ml of DMAC into the mixture, and pass through the magnetic force at 60°C Stirring for 12 hours gave a homogeneous solution. Blow nitrogen into the homogeneous solution for 20 minutes, seal it for storage, and then place it in 60 The irradiation reaction was carried out in the Co source chamber, the irradiation dose was 5.1 kGy, and the dose rate was 1.5 kGy / h. After taking out, use methanol as the precipitant to fully precipitate and suction filter, and use F113 as the extract to perform Soxhlet extraction on the filtrate for 72 hours to remove the homopolymer, and obtain graft polymer 1 with a graft rate of 7.06%. .

[0031] Weigh 0.5 g of graft polymer 1 and 49.5 g of trifluorotoluene into a conical flask, ultrasonicate at room temperature for 30 min, and place at 60° C. for 24 h to obtain a uniformly dispersed film-for...

Embodiment 2

[0033] The irradiation grafting conditions were the same as those in Example 1, wherein the amount of monomer TEMAc-8 and solvent DMAC added were 4.0ml and 46ml, respectively, to obtain graft polymer 2 with a grafting rate of 30.67%. The hydrophobic separation membrane 2 was obtained by using the pretreatment method and modification conditions of the base membrane in Example 1, and the membrane distillation desalination performance of the hydrophobic separation membrane 2 was measured by the method in Example 1.

[0034] figure 1 It is the infrared spectrogram of the PAN base membrane and the prepared hydrophobic separation membrane 1 and 2 in the above-mentioned examples 1 and 2. The results showed that, compared with the PAN membrane, the hydrophobic separation membranes 1 and 2 were separated at 1740cm -1 There is an obvious ester group characteristic peak at the place, which proves that there is graft polymer B on the surface of the membrane after spraying; the hydrophobi...

Embodiment 3

[0039] This example is a blank example. The PAN base film used in Examples 1 and 2 was treated with plasma Ar according to the method described in Example 1, the irradiation power was 100W, and the irradiation time was 3min to obtain a modified film 3, whose pure water contact angle was 22°, and water penetration The pressure is lower and cannot be used in the membrane distillation desalination process. The positive effects of spray modification in Examples 1 and 2 are proved.

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Abstract

A preparation method of a hydrophobic separating membrane. The method comprises the following steps: dissolving hydrophobic monomers and a conventional polymer membrane production material A in a solvent to form a homogeneous solution, conducting gamma ray irradiation treatment on the homogeneous solution to induce a grafting reaction to obtain a hydrophobic graft polymer B, dissolving or dispersing the hydrophobic graft polymer in B in an organic solvent to form a membrane production liquid, and spraying or coating the membrane production liquid on the porous base membrane surface to form a hydrophobic separating membrane. The hydrophobic separating membrane can be used in membrane distillation, membrane absorption, membrane extraction, steam penetration, penetration vaporization or oil-water separation process. The invention overcomes the defects of complex membrane preparation process, narrow material selection range, poor hydrophobic stability and uneasily controlled pore structure in the prior art for preparation of hydrophobic separating membrane. The separating membrane prepared through the method provided by the invention has the advantages of controllable pore size, strong hydrophobicity and good hydrophobic stability, etc.

Description

technical field [0001] The invention relates to a preparation method of a hydrophobic separation membrane, in particular to a preparation method of a hydrophobic separation membrane which can be used in processes such as membrane distillation, membrane absorption, membrane extraction, steam permeation, pervaporation or oil-water separation. Background technique [0002] As a green and efficient separation technology, membrane separation technology has been widely used in many industrial fields such as chemical industry, medicine, energy, environmental protection, food and seawater desalination after decades of development. According to the characteristics of the separation system, some separation processes in practical applications require the membrane to have a certain degree of hydrophobicity and hydrophobic stability. For example, in the process of membrane distillation, the surface of the separation membrane needs to have strong hydrophobicity to prevent the liquid from ...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/02B01D67/00
Inventor 沈飞万印华刘丽霞陈向荣苏仪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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