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Modified nanoparticle suspension as well as preparation method and application thereof

A nanoparticle and suspension technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of nanoparticle agglomeration, difficult agglomeration of nanoparticles, and fouling of separation membranes, achieving simple process and easy raw materials. The effect of obtaining, increasing hydrophilicity or oleophobicity

Active Publication Date: 2019-06-21
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: for the excessive SiO in the existing technology 2 The content will cause the problem of nanoparticle agglomeration. The present invention provides a modified nanoparticle suspension and its preparation method and application. This method has simple process, simple operation and low cost. Isomerized hexadecane, and can withstand high temperature and low temperature damage, can be applied to the preparation of adjustable wettability separation membranes, and has great application prospects in solving the pollution problem of separation membranes

Method used

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  • Modified nanoparticle suspension as well as preparation method and application thereof
  • Modified nanoparticle suspension as well as preparation method and application thereof
  • Modified nanoparticle suspension as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At room temperature, 9 parts by volume of 25 vt.% ammonia solution and 16 parts by volume of deionized aqueous solution were ultrasonically dispersed and mixed for 5 minutes, and then 2 parts by mass of silica sol was added dropwise, and a clear mixed solution was obtained after ultrasonic dispersion for 5 minutes. The silica sol is water-based nano-silica sol, wherein the mass concentration of nano-silica is 15-30%, and the average particle diameter is 5-20 nm. Chain particles or loosely combined into beaded particles of 40-100 nm; the above mixed solution was added dropwise to 180 parts by volume of ethanol, ultrasonicated for 5 minutes, then mechanically stirred for 5 minutes, and then 1.2 parts by volume of normal Tetraethyl silicate solution, continue mechanical stirring for 15 min, then add 1.2 parts by volume of 2 wt.% polyvinyl alcohol solution dropwise, and finally obtain a hydrophilic modified stable solution after continuous mechanical stirring for 12 h; The ...

Embodiment 2

[0032] Within 60 minutes, the 20 parts of the solid content of 15% hydrophilic modified SiO prepared in the above example 1 were prepared by using a spraying process with a spraying pressure of 0.5 MPa and a spray gun with a nozzle diameter of 0.5 mm. 2 The nanoparticle suspension was sprayed into 100 parts of continuous planetary mixing PTFE powder (hydrophilic modified nano-SiO 2 Particles and PTFE powder mass ratio is 3%), the hydrophilic modified nanoparticles can be uniformly dispersed in the PTFE powder, and then prepared into a hydrophilic hollow fiber membrane, the water contact angle of the hydrophilic hollow fiber membrane is 45.1°, while Yu Liyun et al. used the phase inversion method to directly blend nanoparticles with raw materials, SiO 2 When the particle content is 3%, the water contact angle is the lowest at 68.7°. Therefore, the modified particles are added into the hollow fiber membrane in the form of suspension, and the antifouling is better.

Embodiment 3

[0034] Within 60 minutes, the spraying process is a spraying pressure of 0.5 MPa, a spray gun with a nozzle diameter of 0.5 mm, and 100 parts of the modified nanoparticle suspension prepared in the above-mentioned embodiment 1 is sprayed to 100 parts of continuous planetary mixing In PTFE powder (hydrophilic modified nano-SiO 2 The mass ratio of particles to PTFE powder is 15%), the hydrophilic modified nanoparticles can be uniformly dispersed in the PTFE powder, and then prepared into a hydrophilic hollow fiber membrane. The prepared hollow fiber membrane microscopic scanning diagram is shown in figure 2 . Tests the wettability of a water droplet on its surface ( image 3 b), compared to pristine hollow fiber membranes ( image 3 a) Enhanced hydrophilicity. The water contact angle of the original hollow fiber membrane ( image 3 c) is 138.5°, the water contact angle of the hydrophilic hollow fiber membrane ( image 3 d) is 10.1°, and SiO 2 When the mass ratio of PTFE p...

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Abstract

The invention discloses a modified nanoparticle suspension, as well as a preparation method and application thereof, belonging to the field of new chemical materials. The preparation method comprisesthe following steps: uniformly stirring and dispersing aqueous silica sol, tetraethyl orthosilicate and a modifier under an alkaline condition for reaction, and concentrating a product to 10 times byadopting a rotary evaporation concentration technology; carrying out freeze drying on a concentrated solution to obtain nano powder; dispersing the prepared nano powder in isomeric hexadecane; and carrying out dispersing by using an ultrasonic cell crusher to obtain a suspension containing modified nanoparticles. The solid content of the suspension is 1-15%, a solvent is isomeric hexadecane, and the nanoparticles are silica particles. The method uses simple equipment and process, is simple to operate and is low in cost; the prepared powder is nano-scale, is not easy to agglomerate, can be stably dispersed in isomeric hexadecane for a long time, can withstand damages at a high temperature and a low temperature, and can be applied to preparation of a separation membrane with adjustable wettability; and as a novel hollow fiber membrane pore-forming agent, the powder has great application prospects in large-scale production and solving problems such as separation membrane pollution.

Description

technical field [0001] The invention belongs to the field of new chemical materials, and in particular relates to a modified nanoparticle suspension and its preparation method and application. Background technique [0002] With the increase of population pressure and the development of industrial production, water pollution and water shortage have become inevitable and increasingly serious problems. People want to solve this problem through desalination of seawater, separation and concentration of aqueous solution, treatment of industrial wastewater, etc. Therefore, separation membrane technology has emerged as the times require. Among them, the hollow fiber membrane is the most widely used, but it has the problem of membrane fouling. The key to solving membrane fouling is to make the membrane hydrophilic or oleophobic in air without affecting its separation function. [0003] At present, there are two commonly used methods to solve the problem of membrane fouling: one i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
Inventor 张友法刘平余新泉吴立新
Owner SOUTHEAST UNIV
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