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PVDF composite graphene filter element membrane and production process thereof

A composite graphene, production process technology, applied in membrane, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of easy agglomeration, poor nanoparticle dispersion, PVDF membrane porosity and permeability decline, etc., to promote sterilization. effect, enhanced hydrophilicity, effect of saving manufacturing time

Active Publication Date: 2018-09-07
宁波杜康陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion of nanoparticles in polyvinylidene fluoride is poor, and they are prone to agglomeration, resulting in varying degrees of decline in the porosity and permeability of the PVDF membrane.

Method used

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  • PVDF composite graphene filter element membrane and production process thereof
  • PVDF composite graphene filter element membrane and production process thereof
  • PVDF composite graphene filter element membrane and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] Preparation of modified graphene:

[0037] 1: Graphene oxide grafted PVP:

[0038] (1) Measure 200mL H 2 O is added graphene oxide 0.1g, after ultrasonic dispersion, obtain the graphene oxide dispersion liquid that concentration is 0.5mg / mL;

[0039] (2) Take by weighing 0.2g PVP and add in the graphene oxide dispersion liquid in step (1), fully stir until completely dissolving;

[0040] (3) Weigh 0.2 g of ascorbic acid and add it to step (2), and stir until it is completely dissolved to obtain a mixed system;

[0041] (4) heating the mixed system of step (3) in a 75°C oil bath for 4h to obtain a graphene oxide grafted PVP solution;

[0042] 2: Loading nano-silver particles:

[0043] (5) transfer the graphene oxide grafted PVP solution in the flask, fill with nitrogen for 10min, and remove the air in the flask;

[0044] (6) Add 0.01g nano silver nitrate powder to step (5), stir for 20min;

[0045] (7) Add the newly prepared 0.128mol / L NaBH dropwise under heating in ...

Embodiment 1

[0051] Step1. Put the PVDF homopolymer into a drying oven at 90°C and dry for 3 hours;

[0052] Step2. Put 45 parts of PVDF homopolymer, 75 parts of DMAC, 1.8 parts of PVP-K30, 0.2 parts of PVP-K90, and 2.5 parts of modified graphene into the reactor, set the temperature at 95°C, and prepare the spinning solution;

[0053] Step3. After the spinning solution is left to defoam, it is spun and formed to make a tow;

[0054] Step4. After soaking the tow in 10% ethanol solution for 10 minutes by mass fraction, put it into the coagulation tank and soak for 28 hours to obtain a hollow fiber bundle with stable pore size;

[0055] Step5. After the hollow fiber bundle is dried, the filter element membrane is obtained.

Embodiment 2

[0057] Step1. Put the PVDF homopolymer into a drying oven at 80°C and dry for 3 hours;

[0058] Step2. Put 30 parts of PVDF homopolymer, 60 parts of DMAC, 0.9 parts of PVP-K30, 0.1 part of PVP-K90, and 0.5 parts of modified graphene into the reaction kettle, set the temperature at 85°C, and prepare the spinning solution;

[0059] Step3. After the spinning solution is left to defoam, it is spun and formed to make a tow;

[0060] Step4. Soak the tow in a 10% ethanol solution by mass fraction for 10 minutes, then put it into the coagulation pool and soak for 24 hours to obtain a hollow fiber bundle with stable pore size;

[0061] Step5. After the hollow fiber bundle is dried, the filter element membrane is obtained.

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Abstract

The invention discloses a PVDF composite graphene filter element membrane and a production process thereof. The objective of the invention is to overcome the problem that the porosity and permeabilityof conventional PVDF membranes are reduced to varying degrees since nanoparticles have poor dispersibility in polyvinylidene fluoride and are prone to agglomeration. According to a technical scheme in the invention, the PVDF composite graphene filter element membrane comprises, by mass, 30 to 45 parts of a PVDF homopolymer, 60 to 75 parts of DMAC, 1 to 2 parts of PVP and 0.5 to 2.5 parts of modified graphene. The above components are added into a reaction vessel for preparation of a spun membrane and spinning molding is carried out; so the dispersibility, hydrophilicity and mechanical strength of the raw materials of a filter element are improved, and the filter element is allowed to have stable filtration precision.

Description

technical field [0001] The invention relates to a PVDF filter element membrane, in particular to a PVDF composite graphene filter element membrane and a production process thereof. Background technique [0002] In the past 20 years, due to the scarcity of water resources, water pollution has become increasingly serious. In order to ensure the safety of drinking water, families now connect water purification equipment to the water outlet of the tap water pipe, and filter out a large amount of harmful substances in the water through water purification. [0003] As a kind of water purification equipment, the ultrafiltration machine differs from other water purification equipment in that it uses a filter membrane. The filter element membrane is a microporous filtration membrane with uniform pore size, which is filtered by the membrane filtration method with pressure difference as the driving force. [0004] Polyvinylidene fluoride (PVDF) has excellent heat resistance, mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D69/08B01D67/00
CPCB01D67/0079B01D69/08B01D69/12B01D71/34B01D2323/46B01D2325/48
Inventor 杜建耀
Owner 宁波杜康陶瓷有限公司
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