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Method for modifying surface of polypropylene separation membrane

A surface modification and separation membrane technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of easy-to-pollution modification process, poor hydrophilicity, and small flux, so as to improve anti-pollution ability, improved surface performance, and increased rejection

Active Publication Date: 2012-10-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for surface modification of polypropylene (PP) separation membranes in order to solve the problems of poor hydrophilicity, small flux, easy pollution and complex modification process of existing polypropylene (PP) separation membranes

Method used

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  • Method for modifying surface of polypropylene separation membrane
  • Method for modifying surface of polypropylene separation membrane
  • Method for modifying surface of polypropylene separation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: The PP membrane was washed successively with nitric acid solution (mass concentration 20%), sodium hydroxide solution (1mol / L), acetone, and deionized water for 10 minutes, 8 minutes, 7 minutes, and 9 minutes respectively, and dried at 50°C for 1 hour.

[0028] Titanium tetrachloride (TiCl 4 ), deionized water (H 2 O) as the precursor, high-purity nitrogen (N 2 ) as carrier and sweep gas. The pulse time of the two precursors was 0.3s and 0.015s respectively, the exposure time of the precursor was 0s, the cleaning time was 5s, and the flow rate of the carrier gas was 20sccm. Heat the temperature of the reaction chamber to 80°C, keep the membrane at the set temperature of the reaction chamber for 20 minutes, and prepare modified membranes with 100, 200, 300, 500, 800, and 1000 cycles respectively.

[0029] Depend on figure 1 It can be seen that with the increase of the deposition times, the titanium oxide particles in the membrane channels and on the surfac...

Embodiment 2

[0033] Example 2: The PP membrane was washed with nitric acid solution (25%), potassium hydroxide solution (1.5mol / L), dichloromethane, and deionized water for 5 minutes, 7 minutes, 9 minutes, and 10 minutes respectively, and dried at 30°C for 2 hours.

[0034] Titanium isopropoxide (heated to 85°C), deionized water (H 2 O) as the precursor, high-purity nitrogen (N 2) as carrier and sweep gas. The pulse time of titanium isopropoxide and water is 0.2s, the exposure time of the precursor is 3s, the cleaning time is 15s, and the flow rate of the carrier gas is 10sccm. Heat the temperature of the reaction chamber to 100°C, keep the membrane at the set temperature of the reaction chamber for 10 minutes, and prepare modified membranes with 200, 400, and 600 cycles respectively.

[0035] After titanium oxide was deposited on the polypropylene film, the static water contact angle decreased with the increase of deposition times. For the modified film deposited 200, 400, and 600 times...

Embodiment 3

[0037] Example 3: The PP membrane was washed successively with nitric acid solution (23%), sodium hydroxide solution (1.3mol / L), acetone, and deionized water for 8 minutes, 6 minutes, 7 minutes, and 10 minutes, and dried at 40°C for 1.5 hours.

[0038] Titanium isopropoxide (heated to 82°C), deionized water (H 2 O) is the precursor, and high-purity argon (Ar) is used as the carrier gas and sweep gas. The pulse time of titanium isopropoxide is 1 s, the pulse time of water is 0.9 s, the exposure time of the precursor is 3 s, the cleaning time is 50 s, and the flow rate of the carrier gas is 15 sccm. Heat the temperature of the reaction chamber to 120° C., keep the film at the set temperature of the reaction chamber for 20 minutes, and deposit titanium oxide 200 times. The measured pure water flux of the modified membrane is 239.39 (L h -1 m -2 · bar -1 ), an increase of 9.9% compared to the original film, a static contact angle of 80.3°, and a rejection rate of 47.2% for BSA...

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Abstract

The invention relates to a method for modifying the surface of a polypropylene separation membrane, belonging to the field of membrane material. According to the method, the problems that the polypropylene separation membrane is poor in hydrophily, small in flux and easy to pollute can be solved; when the modified separation membrane is used as a lithium battery membrane, the performance and the safety of the lithium battery can be improved. According to the method, an oxide thin layer is continuously deposited on the channel surface of the PP separation membrane by using the atomic layer deposition, and the accuracy regulation of the aperture and the surface performance of the separation membrane are realized. The specific steps are as follows: (1) using acid, alkali, organic solvent and water to wash the PP (Propene Polymer) membrane, drying the PP membrane; (2) putting the PP membrane to a reaction chamber of an ALD (atomic layer deposition) instrument; vacuumizing and heating up to the deposition temperature; and maintaining temperature of the membrane for a certain time at set temperature; (3) pulsing metal source titanium tetrachloride or isopropyl titanate, cleaning air, water and cleaning air to the reaction chamber in sequence; and (4) preparing the modified membrane with needed performance by changing cycle indexes. According to the method, not only can the hydrophily, pure water flux and pollution resistance of the PP separation membrane be improved, but also the process is simple; and therefore, the batch production is realized easily.

Description

technical field [0001] The invention relates to a membrane material modification technology, in particular to a method for modifying the surface of a polypropylene separation membrane, more precisely, after depositing titanium oxide on the surface of polypropylene membrane pores by ALD technology, the properties of the membrane surface are precisely controlled , belonging to the field of membrane modification. Background technique [0002] Polypropylene (PP) film is a high-performance polymer film material due to its good chemical stability, heat resistance, acid and alkali resistance, high mechanical strength, and low price. Polypropylene porous membranes prepared by melt stretching and thermally induced phase separation have also attracted increasing attention. At present, polypropylene porous membranes have been used in battery separators, wastewater treatment, gas separation, membrane distillation, blood purification and other fields. [0003] However, due to the stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00
Inventor 汪勇许强杨骏戴佳卫
Owner NANJING UNIV OF TECH
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