Hydrophilization modification method of polyolefin hollow fiber ultrafiltration membrane

A polyolefin and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problem of loss of hydrophilic modified coating or modified adsorbent, and difficulty in obtaining permanent hydrophilic modification. problems such as non-resistance, impossibility of hydrophilic modification of ultrafiltration membrane pores, etc., to achieve excellent chemical resistance, low cost of modification, and easy operation

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the disadvantages of poor hydrophilicity of polyolefin hollow fiber ultrafiltration membranes, resulting in high transmembrane pressure, poor permeability of separation membranes, and easy contamination by organic matter and microorganisms; The modified coating or modified adsorbent is lost during use, it is difficult to obtain permanent hydrophilic modification, and the existing surface modification methods cannot achieve effective hydrophilic modification of the inside of the ultrafiltration membrane membrane pores

Method used

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  • Hydrophilization modification method of polyolefin hollow fiber ultrafiltration membrane

Examples

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Embodiment 1

[0082] A polyolefin hollow fiber ultrafiltration membrane with a pore size of 30 to 50 nanometers prepared by polyvinyl chloride using a melt-spinning-stretching (MSCS) method is made into a standard external pressure hollow fiber membrane module with a diameter of 4 inches.

[0083] Add dopamine hydrochloride as a solute to a tris buffer solution (with water as a solvent), adjust its pH by adding hydrochloric acid dropwise, and prepare dopamine hydrochloride-tris modified with a concentration of 2g / L and a pH value of 8.5 solution.

[0084] Such as figure 1 As shown, the prepared dopamine hydrochloride-tris modified solution stored in the raw material tank 7 is passed through the pump 2 into the external pressure hollow fiber membrane module, and the external pressure operation is adopted. By adjusting the speed of the pump 2 and the first pressure regulating valve 4, the transmembrane pressure is adjusted so that the dopamine hydrochloride-tris modified solution is infiltra...

Embodiment 2

[0089] Polyvinylidene fluoride (PVDF) polyolefin hollow fiber ultrafiltration membrane with a pore size of 30 to 50 nanometers prepared by thermally induced phase separation (TIPS) method is made into a standard external pressure hollow fiber membrane module with a diameter of 9 inches.

[0090] Add dopamine hydrochloride as a solute to a tris buffer solution (with water as a solvent), adjust its pH by adding hydrochloric acid dropwise, and prepare dopamine hydrochloride-tris modified with a concentration of 0.1g / L and a pH value of 8.5. neutral solution.

[0091] Such as figure 1 As shown, the prepared dopamine hydrochloride-tris modified solution stored in the raw material tank 7 is passed through the pump 2 into the external pressure hollow fiber membrane module, and the external pressure operation is adopted. By adjusting the rotational speed of the pump 2 and the first pressure regulating valve 4, the transmembrane pressure is adjusted, so that the dopamine hydrochloride...

Embodiment 3

[0096] The polyolefin hollow fiber ultrafiltration membrane with an average pore size of 150-200 nanometers prepared from polyethylene (PE) by the thermally induced phase separation (TIPS) method is made into a standard external pressure hollow fiber membrane module with a diameter of 9 inches.

[0097] Add dopamine hydrochloride as a solute to tris buffer solution (water and methanol as solvent, mass ratio is 1:1), adjust its pH by adding hydrochloric acid dropwise, and prepare the concentration to be 10g / L, the pH value 10 dopamine hydrochloride-tris modified solution.

[0098] Such as figure 1 As shown, the prepared dopamine hydrochloride-tris modified solution stored in the raw material tank 7 is passed through the pump 2 into the external pressure hollow fiber membrane module, and the external pressure operation is adopted. By adjusting the rotating speed of the pump 2 and the first pressure regulating valve 4, the transmembrane pressure is adjusted, so that the dopamine...

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Abstract

The invention relates to a hydrophilization modification method of a polyolefin hollow fiber ultrafiltration membrane, especially relates to a method using dopamine or dopamine derivatives for forming a hydrophilic modification layer on the polyolefin hollow fiber ultrafiltration membrane surface and in membrane holes. The method avoids the influence of polyolefin material structure, can effectively maintain the structural and mechanical properties of the polyolefin membrane, and overcomes the shortcomings that modification in the membrane holes cannot be achieved by irradiation grafting and plasma surface grafting technology. According to the method, an ultrathin poly dopamine or dopamine derivative hydrophilic modification layer prepared by the method can be combined firmly with a polyolefin hollow fiber ultrafiltration membrane material may not be lost in the use process, the modified membrane is stable and reliable in properties, and has good application prospects in water treatment, petrochemical, pharmaceutical, biological, energy and other areas.

Description

technical field [0001] The invention relates to the technical field of membrane preparation and membrane surface modification, in particular to a method for hydrophilic modification of polyolefin hollow fiber ultrafiltration membranes, especially the use of dopamine or dopamine derivatives on the surface of polyolefin hollow fiber ultrafiltration membranes and A hydrophilic modified layer is formed in the membrane pores to improve the hydrophilicity and anti-microbial pollution of the polyolefin hollow fiber ultrafiltration membrane. Background technique [0002] Membrane separation is a separation technology that appeared in the early 20th century and rose rapidly after the 1960s. It is considered to be "one of the most promising and promising major high-tech technologies in the 21st century." The membrane separation process uses the selective permeable membrane as the separation medium. Under the action of one or several driving forces such as pressure difference, concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D63/02B01D71/26B01D71/34B01D71/36B01D71/30B01D69/08
Inventor 魏昕奚振宇杨永强杨丽
Owner CHINA PETROLEUM & CHEM CORP
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