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Preparation method of in-situ synthesized nano silver modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane

An in-situ synthesis, nano-silver technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy aggregation of nanoparticles and ineffective improvement of anti-pollution performance of PVDF ultrafiltration membranes, etc. Achieve the effects of enhancing hydrophilicity and antibacterial properties, increasing water flux, and increasing hydrophilicity

Active Publication Date: 2014-10-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve existing inorganic nano-particle modified PVDF ultrafiltration membrane and existing nano-particle is easily agglomerated in the membrane, and nano-particle diffuses to water phase during phase separation, is enriched on the membrane surface, and is resistant to PVDF ultrafiltration membrane. The improvement effect of pollution performance is not obvious, and a preparation method for in-situ synthesis of nano-silver modified PVDF ultrafiltration membrane is provided

Method used

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  • Preparation method of in-situ synthesized nano silver modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane
  • Preparation method of in-situ synthesized nano silver modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane
  • Preparation method of in-situ synthesized nano silver modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane

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specific Embodiment approach 1

[0027] Specific embodiment one: this embodiment is a kind of preparation method of in-situ synthesis nano-silver modified PVDF ultrafiltration membrane, specifically completes according to the following steps:

[0028] 1. Preparation of PVDF solution: Mix PVDF powder with dispersing solvent Ⅰ, stir at a stirring speed of 400r / min-600r / min and a temperature of 50°C-60°C for 4h-6h to obtain a PVDF solution;

[0029] The mass ratio of PVDF powder and dispersion solvent I described in step 1 is 16:(70~100);

[0030] 2. Preparation of mixed solution containing nano-silver: AgNO 3 Dissolve in dispersing solvent II, then add porogen, and then ultrasonically disperse at a power of 50W-550W for 60min-120min to obtain a mixed solution containing nano-silver;

[0031] AgNO as described in step 2 3 The mass of dispersing solvent II is 1:(10~50);

[0032] AgNO as described in step 2 3 The mass ratio to porogen is 1:(0.5~3);

[0033] 3. Preparation of casting solution: at a stirring sp...

specific Embodiment approach 2

[0045] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the dispersing solvent I described in step 1 is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl -2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the dispersion solvent II described in step 2 is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl-2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of an in-situ synthesized nano silver modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane and relates to a preparation method of a modified PVDF ultrafiltration membrane. The preparation method disclosed by the invention is used for solving the problems that in the prior art, nano particles are easy to aggregate in an existing inorganic nano particle modified PVDF ultrafiltration membrane, the nano particles are diffused towards a water phase during phase separating and are enriched on the surface of the membrane and the improvement of anti-pollution performance of the PVDF ultrafiltration membrane is not obvious. The preparation method comprises the following steps: (1) preparing a PVDF solution; (2) preparing a mixed solution containing nano silver; (3) preparing a casting membrane solution; (4) casting and forming a membrane; (5) washing to obtain the in-situ synthesized nano silver modified PVDF ultrafiltration membrane. The pure water flux of the prepared in-situ synthesized nano silver modified PVDF ultrafiltration membrane is 110-180L / m<2>.h and the flux during pollution test is 70-90L / m<2>.h. According to the preparation method, the in-situ synthesized nano silver modified PVDF ultrafiltration membrane can be obtained.

Description

technical field [0001] The invention relates to a method for modifying a PVDF ultrafiltration membrane. Background technique [0002] In the past thirty years, membrane filtration technology has developed rapidly in water treatment applications, and ultrafiltration technology is called green physical separation technology. It can not only replace the traditional long-flow separation process mainly based on coagulation sedimentation filtration, but also can almost completely remove pathogenic microorganisms. In principle, it can also save the subsequent disinfection unit, thereby greatly shortening the treatment process. However, membrane fouling and membrane clogging are still important factors restricting the popularization and application of membrane separation technology. [0003] Among the commonly used membrane materials at present, polyvinylidene fluoride has good thermal stability, chemical stability, radiation resistance and excellent mechanical properties, and is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00C02F1/44
Inventor 马军钟翔燕王盼盼孙志强
Owner HARBIN INST OF TECH
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