PDMS (Polydimethylsiloxane)-PVDF (Polyvinylidene Fluoride) composite membrane for separating organic vapor and modification-preparation method thereof

A PDMS-PVDF, organic vapor technology, applied in the field of PDMS-PVDF composite membrane and its modification preparation, can solve the problems of high energy consumption, secondary pollution of the environment, poor safety, etc. in the recycling method, and achieve improved interface performance and high bonding strength. , the effect of good durability

Active Publication Date: 2013-09-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The elimination method has high energy consumption and has secondary pollution to the environment; the recovery method also requires high energy consumption and has poor safety

Method used

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  • PDMS (Polydimethylsiloxane)-PVDF (Polyvinylidene Fluoride) composite membrane for separating organic vapor and modification-preparation method thereof
  • PDMS (Polydimethylsiloxane)-PVDF (Polyvinylidene Fluoride) composite membrane for separating organic vapor and modification-preparation method thereof
  • PDMS (Polydimethylsiloxane)-PVDF (Polyvinylidene Fluoride) composite membrane for separating organic vapor and modification-preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dry the PVDF membrane (self-made or purchased) at 50°C first, then put the obtained PVDF bottom membrane into the toluene solution with a mass fraction of 5% of PDMS and soak for 2 hours; take it out and dry it until no liquid seeps out and put it in a vacuum oven , and dried at 80°C for 12h. Put the processed PVDF base film into the pre-adjusted low-temperature plasma reaction chamber, control the plasma emission power to 25W, the reaction temperature to 50°C, and the irradiation time to 40s. Reserve after the reaction is complete. Dissolve polydimethylsiloxane PDMS prepolymer in n-heptane solvent, wherein the mass fraction of PDMS is 30%, mix well and add cross-linking agent vinyltrimethoxysilane, the dosage is PDMS-n-heptane 8% of the total weight of the alkane solution; then add dibutyltin dilaurate as a catalyst in an amount of 2% of the total weight of the PDMS-n-heptane solution, stir evenly by magnetic force and let it stand for defoaming. Afterwards, the obta...

Embodiment 2

[0034] The PVDF membrane (self-made or purchased) was first replaced with absolute ethanol for 2 hours, and the other steps were the same as in Example 1.

Embodiment 3

[0036] Soak the PVDF membrane (self-made or purchased) with deionized water for 2 hours first, and the other steps are the same as in Example 1.

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Abstract

The invention belongs to the technical field of gas permeable membrane separation and in particular relates to a PDMS (Polydimethylsiloxane)-PVDF (Polyvinylidene Fluoride) composite membrane for separating organic vapor and a modification-preparation method thereof. The modification-preparation method of the PDMS-PVDF composite membrane comprises the following steps of: firstly, carrying out surface pre-treatment onto a PVDF supporting bottom membrane; then, soaking the pre-treated bottom membrane into a toluene solution of PDMS; placing the soaked bottom membrane in a plasma modification reaction device, carrying out plasma radiation and taking out after a certain time; finally, coating the prepared PDMS membrane casting solution on the treated PVDF bottom membrane, and cross-linking and curing at different temperatures to obtain the treated PDMS-PVDF compsosite separating membrane. The PDMS-PVDF composite membrane obtained by modification in the invention is compact and free of defects; the bonding strength of the PDMS separating layer and the PVDF is remarkably improved and a hole leakage phenomenon is effectively prevented. The PDMS-PVDF composite membrane obtained by modification is used for separating a propane-nitrogen gas system, so that the total flux reaches 1.93*10<-2>cm<3>/cm<2>.s, and the separating factor reaches 25.1.

Description

technical field [0001] The invention belongs to the technical field of vapor permeation membrane separation, and in particular relates to a PDMS-PVDF composite membrane for separating organic vapor and a modification preparation method thereof. Background technique [0002] With the development of economy and social progress, the rapid development of chemical, petrochemical and pharmaceutical industries, the issue of VOC emissions has increasingly attracted people's attention. From the comprehensive consideration of environmental protection, resource recovery and human health, it is an urgent problem to recover valuable VOCs and reduce VOC emissions. [0003] There are two main types of traditional VOCs treatment methods: one is the elimination method, such as incineration, photocatalytic oxidation and catalytic combustion; the other is the recovery method, the commonly used recovery methods are carbon adsorption, pressure swing adsorption method, condensation method, coron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00B01D53/22
Inventor 李继定房满权操建华夏阳
Owner TSINGHUA UNIV
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