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Preparation method of hydrophilic copolymer coated nano-oxide modified hollow fiber membrane

A hydrophilic copolymer and nano-oxide technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc. Good, high mechanical strength, the effect of alleviating agglomeration

Active Publication Date: 2016-12-07
HANGZHOU FANGRAN MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects existing in the prior art, the hydrophilic modifier is easily lost during use and cannot take into account the loss of mechanical properties caused by blending, etc., the present invention provides a hydrophilic copolymer coated nano-oxide modified The preparation method of permanent polyvinylidene fluoride film, firstly synthesize an organic-inorganic composite of hydrophilic polymer coated nano-oxide particles, use it as a blending modifier and prepare it by conventional solution-induced phase inversion method PVDF hollow fiber membrane

Method used

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  • Preparation method of hydrophilic copolymer coated nano-oxide modified hollow fiber membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) P(MMA-co-MAA)@SiO 2 Composite preparation: first add 3wt% nano-SiO to the glass container sequentially 2 , 97wt% solvent DMAc. Finally, put the glass container into an ultrasonic cleaning tank, control the temperature at 60°C, and ultrasonicate for 45 minutes to make the SiO 2 Disperse evenly. Add the dispersed solution to the reactor, add the reaction monomers MMA and MAA, the total monomer content is 30wt%, the mass ratio of MMA to MAA is 5:5, and then add the initiator azobis Isobutyronitrile was stirred with nitrogen gas for 30 minutes, and the air in the reaction kettle was discharged. Under the protection of nitrogen, react for 24h, and the reaction temperature is 65°C. After the reaction, the system was a pale yellow transparent viscous emulsion. The emulsion was purified by dialysis with pure water in a dialysis bag for 24 hours to replace the solvent and soluble small molecule polymer. After dialysis, the liquid was dried in a vacuum oven at 60°C for la...

Embodiment 2

[0032] (1) P(MMA-co-NVP)@SiO 2 Composite preparation: first add 3wt% nano-SiO to the glass container sequentially 2 , 97wt% solvent NMP. Finally, put the glass container into an ultrasonic cleaning tank, control the temperature at 60°C, and ultrasonicate for 30 minutes to make the SiO 2 Disperse evenly. Add the dispersed solution to the reactor, add the reaction monomers MMA and NVP, the total monomer content is 30wt%, the mass ratio of MMA to NVP is 4:6, and then add the initiator azobisiso Heptanitril was stirred with nitrogen gas for 30 minutes, and the air in the reaction kettle was discharged. Under the protection of nitrogen, react for 24h, and the reaction temperature is 65°C. After the reaction, the system was a pale yellow transparent viscous emulsion. The emulsion was purified by dialysis with pure water in a dialysis bag for 24 hours to replace the solvent and soluble small molecule polymer. After dialysis, the liquid was dried in a vacuum oven at 60°C for later...

Embodiment 3

[0038] (1) Complex P(MMA-co-MAA)@TiO 2 Preparation: first add 2.5wt% nano-TiO to the glass container sequentially 2 , 96.5 wt% solvent DMAc. Finally, put the glass container into an ultrasonic cleaning tank, control the temperature at 60°C, and ultrasonicate for 60 minutes to make the TiO 2 Disperse evenly. Add the dispersed solution to the reactor, add the reaction monomers MMA and MAA, the total monomer content is 40wt%, the mass ratio of MMA to MAA is 3:7, and then add the initiator azobis Isobutyronitrile was stirred with nitrogen gas for 30 minutes, and the air in the reaction kettle was discharged. Under the protection of nitrogen, react for 8h, and the reaction temperature is 70°C. After the reaction, the system was a transparent and viscous emulsion. The emulsion was purified by dialysis for 24 hours with pure water in a dialysis bag to replace the solvent and soluble small molecule polymer. After dialysis, the liquid was dried in a vacuum oven at 60°C for later us...

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Abstract

The invention provides a preparation method of a hydrophilic copolymer coated nano-oxide modified hollow fiber membrane. The preparation method is characterized by including following steps: (1), preparing a compound; (2), preparing membrane casting liquid; (3), preparing a modified membrane. A method of adding hydrophilic copolymer coated nano-oxide for blending is adopted, so that organic-inorganic phases of the compound are combined well; less proneness to loss in the process of membrane forming is realized, so that hydrophilic performance of membrane silk is improved, and mechanical performance and penetrating performance of the membrane silk are improved greatly. The preparation method is simple to operate, mild in polymerization reaction conditions and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of polymer membrane modification, and mainly relates to a preparation method of a hydrophilic copolymer-coated nano oxide blend modified PVDF hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) has become one of the raw materials for the preparation of ultrafiltration membranes due to its excellent chemical stability, good mechanical properties and film-forming properties. PVDF ultrafiltration membranes are widely used in industrial sewage treatment, drinking water preparation, food industry, medical and health industries. However, the surface energy of PVDF material is low, and it is easy to adsorb organic pollutants in application, resulting in a decrease in membrane flux, seriously affecting the service life of ultrafiltration membranes, and restricting its application in the field of separation. [0003] At present, PVDF ultrafiltration membrane modification mainly includes membran...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/087B01D71/34B01D2325/36
Inventor 赵经纬谢柏明马旭敏王炎锋张旭良于皝叶麒
Owner HANGZHOU FANGRAN MEMBRANE TECH
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