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A kind of nanometer silver hollow microsphere/pvdf ultrafiltration membrane and preparation method thereof

A technology of hollow microspheres and nano-silver, which is applied in the direction of microsphere preparation, ultrafiltration, microcapsule preparation, etc., to achieve the effects of improved service life, good surface permeability, and high specific surface area

Active Publication Date: 2021-03-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few studies on nano-silver / PVDF ultrafiltration membranes. Ma Jun et al. proposed in the patent "A Preparation Method for In-Situ Synthesis of Nano-Silver Modified PVDF Ultrafiltration Membranes" that the PVDF ultrafiltration membrane can mainly improve Dispersion of nano-silver in PVDF ultrafiltration membrane and improvement of anti-pollution ability of the membrane
However, the prepared nano-silver only plays an antibacterial role in the ultrafiltration membrane.

Method used

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  • A kind of nanometer silver hollow microsphere/pvdf ultrafiltration membrane and preparation method thereof
  • A kind of nanometer silver hollow microsphere/pvdf ultrafiltration membrane and preparation method thereof
  • A kind of nanometer silver hollow microsphere/pvdf ultrafiltration membrane and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The specific preparation method of nano-silver hollow microspheres is as follows:

[0041] The first step is the preparation of polymer microspheres.

[0042] (1) First prepare the template ball, the specific experimental steps are as follows:

[0043] Using dimethylacetamide as solvent, azobisisobutyronitrile as initiator, and A and B (the molar ratio of A and B is 2:8, wherein, A is methyl methacrylate, B is butyl methacrylate Esters) are mixed and added dropwise into the reactor for free radical copolymerization reaction to generate polymethyl methacrylate-co-butyl methacrylate copolymer. The reaction temperature is 70°C and the reaction time is 8h. During the whole reaction process, Nitrogen protection. Wherein, the amount of azobisisobutyronitrile is 0.3% of the total mass of the monomer, and the monomer dissolved in the solvent is dropped into the reactor at a rate of 40 drops / min. After the reaction, the product was washed three times with petroleum ether and ...

Embodiment 2

[0057] The specific preparation method of nano-silver hollow microspheres is as follows:

[0058] The first step is the preparation of polymer microspheres.

[0059] First prepare the template spheres. The specific experimental steps are as follows: using dimethylacetamide as a solvent, azobisisoheptanonitrile as an initiator, and A and B (the molar ratio of A and B is 5:5, wherein A is 2-methyl methacrylate , B is ethyl methacrylate, isobornyl methacrylate) mixed and added dropwise to the reactor for free radical copolymerization to generate poly 2-methyl methacrylate-co-isobornyl methacrylate copolymer , the reaction temperature is 75° C., the reaction time is 9 h, and the nitrogen gas is protected during the whole reaction process. Wherein, the amount of azobisisoheptanonitrile is 0.4% of the total mass of the monomers, and the monomers dissolved in the solvent are dripped into the reactor at a rate of 50 drops / min. After the reaction, the product was washed three times ...

Embodiment 3

[0072] The specific preparation of nano silver hollow microspheres is as follows:

[0073] The first step is the preparation of polymer microspheres.

[0074] (1) First prepare the template ball, the specific experimental steps are as follows:

[0075] Use dimethylacetamide as solvent and azobisisobutyronitrile as initiator, mix with A and B (the molar ratio of A and B is 8:2, where A is methyl acrylate, B is ethyl acrylate) and drop Add it into the reactor for free radical copolymerization reaction to form polymethyl acrylate-co-ethyl acrylate copolymer, the reaction temperature is 80°C, the reaction time is 10h, and the nitrogen is protected during the whole reaction process. Wherein, the amount of azobisisobutyronitrile is 5‰ of the total mass of the monomer, and the monomer dissolved in the solvent is dripped into the reactor at a rate of 60 drops / min. After the reaction, the product was washed three times with petroleum ether and deionized water respectively, and dried ...

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Abstract

The invention provides polymer microspheres using A-co-B copolymer as the core and C-co-D crosslinking copolymer as the shell. Hollow polymer microspheres are obtained through polymer hydrolysis, andthe surfaces of the hollow polymer microspheres are loaded with metal nano silver particles to obtain nano silver hollow microspheres. The nano silver hollow microspheres have a unique hollow structure and are lightweight, large in specific surface area, good in surface permeability and the like. The nano silver hollow microspheres and PVDF are subjected to blending extrusion and tape casting to obtain a nano silver hollow microsphere / PVDF ultrafiltration membrane, and the nano silver hollow microspheres are used as the water channel of the ultrafiltration membrane and have good antibacterialand anti-pollution effects.

Description

technical field [0001] The invention belongs to the technical field of preparation of ultrafiltration membranes, in particular to a nano-silver hollow microsphere / PVDF ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration technology has a good removal effect on particulate matter and protozoa in source water, effectively ensuring the quality of treated water and the safety of drinking water organisms, no chemical reactions occur during the ultrafiltration process, no heat input is required, and no The disposal medium needs to be regenerated. The ultrafiltration process occupies a small area, is easy to realize large-scale, and has a high degree of automation. These advantages enable ultrafiltration technology to be applied in water treatment membranes on a large scale. However, during the use of ultrafiltration membranes, fouling is inevitable. The phenomenon of membrane fouling is relatively complicated, and it is difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/26C08J5/18C08F220/18C08F220/14C08F220/22C08F220/24C08L27/16C08L33/12C08L33/16B01D61/14B01D71/34B01D69/12B01D67/00B01J13/14
CPCB01D61/145B01D69/12B01D69/125B01D71/34B01D2325/48B01J13/14C08F220/18C08F220/22C08J5/18C08J9/26C08J2327/16C08J2333/16C08J2433/12C08J2433/16C08F220/1804C08F220/24C08F220/14
Inventor 马文中张鹏夏艳平彭辉赵宇辰钟璟龚方红陶国良
Owner CHANGZHOU UNIV
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